{"product_id":"liquid-gypsum-micronised-calcium-sulphate","title":"Liquid Gypsum | Organic Calcium Fertiliser \u0026 Clay Soil Conditioner | For Tomatoes, Lawns \u0026 Heavy Clay | Dr Forest","description":"\u003c!-- Dr Forest — Micronised Gypsum Fertiliser Product Page --\u003e\u003c!-- Prefix: drf-gy- (gypsum) --\u003e\u003c!-- Embedded JSON-LD: Product + FAQPage (12 Q\u0026As) + HowTo (5 sections, 16 steps) at end of file --\u003e\u003c!-- SEO broadening 15 May 2026: H2 retargeted to liquid calcium fertiliser + clay soil conditioner + tomatoes + lawns + heavy clay; lead paragraph added; use-case bullets reordered to surface BER, lawn, clay, calcium fertiliser first --\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!-- Pure CSS radio-input tabs. No JavaScript. Shopify-safe. --\u003e\n\u003cstyle\u003e\n  .drf-wrap *, .drf-wrap *::before, .drf-wrap *::after { box-sizing: border-box; margin: 0; padding: 0; }\n  .drf-wrap { font-family: 'Jost', sans-serif; font-weight: 400; color: #2c2c2c; font-size: 14px; line-height: 1.65; width: 100%; max-width: 100%; overflow: hidden; }\n  :root {\n    --drf-grn:        #1B3D2F;\n    --drf-grn-light:  #E8F0EB;\n    --drf-grn-mid:    #4a7a5e;\n    --drf-grn-dark:   #0f2a1e;\n    --drf-gold:       #C5A55A;\n    --drf-gold-light: #FAF7F0;\n    --drf-cream:      #F5F2EC;\n    --drf-border:     #d4cfc5;\n    --drf-muted:      #666;\n  }\n  .drf-wrap h2 { font-family: 'Cormorant Garamond', serif; font-weight: 600; font-size: 1.9em; color: var(--drf-grn); line-height: 1.25; margin-bottom: 0.5em; }\n  .drf-wrap h3 { font-family: 'Cormorant Garamond', serif; font-weight: 600; font-size: 1.35em; color: var(--drf-grn); margin: 1.4em 0 0.4em; }\n  .drf-wrap h4 { font-family: 'Jost', sans-serif; font-weight: 600; font-size: 0.85em; letter-spacing: 0.1em; text-transform: uppercase; color: var(--drf-muted); margin: 1.2em 0 0.3em; }\n  .drf-wrap p { margin-bottom: 0.9em; }\n  .drf-wrap ul { padding-left: 1.2em; margin-bottom: 0.9em; }\n  .drf-wrap ul li { margin-bottom: 0.35em; }\n  .drf-wrap strong { font-weight: 600; color: var(--drf-grn); }\n  .drf-wrap em { font-style: italic; color: var(--drf-muted); }\n\n  \/* ── BADGES ── *\/\n  .drf-badge-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 7px; margin: 0 0 12px; }\n  .drf-badge { padding: 9px 12px; border-radius: 2px; font-size: 11px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; display: flex; align-items: center; justify-content: center; text-align: center; min-height: 36px; line-height: 1.3; }\n  .drf-badge-green { background: #eaf4ea; color: #2d6a2d; border: 1px solid #c0d8b0; }\n  .drf-badge-gold  { background: #fdf6e3; color: #8b6914; border: 1px solid #e0cc80; }\n  .drf-badge-dark  { background: #1c2b1a; color: #d4e4c8; border: 1px solid #2d6a2d; }\n\n  .drf-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--drf-border); border: 1px solid var(--drf-border); margin: 1.2em 0; max-width: 100%; }\n  .drf-stat { background: var(--drf-grn-light); padding: 0.6em 0.5em; text-align: center; }\n  .drf-stat-number { font-family: 'Cormorant Garamond', serif; font-size: 1.35em; font-weight: 700; color: var(--drf-grn); line-height: 1.1; display: block; }\n  .drf-stat-label { font-size: 0.6em; font-weight: 500; letter-spacing: 0.06em; text-transform: uppercase; color: var(--drf-muted); display: block; margin-top: 0.15em; }\n\n  .drf-tabs-wrap { max-width: 100%; overflow: hidden; }\n  .drf-tabs-wrap input[type=\"radio\"] { display: none; }\n  .drf-tab-labels { display: flex; align-items: stretch; border-bottom: 2px solid var(--drf-border); margin-bottom: 1.2em; }\n  .drf-tab-labels label { flex: 1 1 0; padding: 0.75em 0.4em; font-size: 0.72em; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; color: #8b6914; background: var(--drf-gold-light); cursor: pointer; text-align: center; display: flex; align-items: center; justify-content: center; border-bottom: 3px solid var(--drf-gold); margin-bottom: -2px; transition: all 0.15s; }\n  .drf-tab-labels label:hover { color: var(--drf-grn); background: var(--drf-grn-light); border-bottom-color: var(--drf-grn); }\n  .drf-panel { display: none; }\n  #drf-gy-tab1:checked ~ .drf-tab-labels label[for=\"drf-gy-tab1\"],\n  #drf-gy-tab2:checked ~ .drf-tab-labels label[for=\"drf-gy-tab2\"],\n  #drf-gy-tab3:checked ~ .drf-tab-labels label[for=\"drf-gy-tab3\"],\n  #drf-gy-tab4:checked ~ .drf-tab-labels label[for=\"drf-gy-tab4\"],\n  #drf-gy-tab5:checked ~ .drf-tab-labels label[for=\"drf-gy-tab5\"] { color: var(--drf-grn); background: var(--drf-grn-light); border-bottom-color: var(--drf-grn); font-weight: 700; }\n  #drf-gy-tab1:checked ~ .drf-panels #drf-gy-panel1,\n  #drf-gy-tab2:checked ~ .drf-panels #drf-gy-panel2,\n  #drf-gy-tab3:checked ~ .drf-panels #drf-gy-panel3,\n  #drf-gy-tab4:checked ~ .drf-panels #drf-gy-panel4,\n  #drf-gy-tab5:checked ~ .drf-panels #drf-gy-panel5 { display: block; }\n\n  .drf-callout { background: var(--drf-grn-light); border-left: 3px solid var(--drf-grn); padding: 1em 1.2em; margin: 1.2em 0; border-radius: 0 3px 3px 0; }\n  .drf-callout-gold { background: var(--drf-gold-light); border-left-color: var(--drf-gold); }\n  .drf-callout p:last-child { margin-bottom: 0; }\n  .drf-callout-title { font-size: 0.72em; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--drf-grn); margin-bottom: 0.4em; display: block; }\n  .drf-callout-gold .drf-callout-title { color: var(--drf-gold); }\n\n  .drf-mech { border: 1px solid var(--drf-border); border-left: 3px solid var(--drf-gold); padding: 1em 1.2em; margin: 0.8em 0; border-radius: 0 3px 3px 0; background: var(--drf-grn-light); }\n  .drf-mech-num { font-family: 'Cormorant Garamond', serif; font-size: 2em; font-weight: 600; color: var(--drf-gold); line-height: 1; }\n  .drf-mech h4 { margin-top: 0.2em; color: var(--drf-grn); text-transform: none; letter-spacing: 0; font-size: 1em; }\n  .drf-mech p { font-size: 0.92em; color: #555; margin-bottom: 0; }\n\n  .drf-rate { border: 1px solid var(--drf-border); padding: 1em 1.2em; margin: 0.8em 0; border-radius: 3px; background: var(--drf-grn-light); }\n  .drf-rate h4 { margin-top: 0; color: var(--drf-grn); text-transform: none; letter-spacing: 0; font-size: 1em; font-family: 'Cormorant Garamond', serif; border-bottom: 1px solid var(--drf-border); padding-bottom: 0.5em; margin-bottom: 0.6em; }\n  .drf-rate-meta { font-size: 0.85em; color: #555; margin-bottom: 0.5em; }\n  .drf-rate-meta strong { color: var(--drf-gold); }\n  .drf-rate p { font-size: 0.92em; color: #555; margin-bottom: 0; }\n\n  .drf-steps { counter-reset: drf-step; list-style: none; padding: 0; }\n  .drf-steps li { counter-increment: drf-step; padding: 0.8em 0 0.8em 3em; position: relative; border-bottom: 1px solid #eee; }\n  .drf-steps li::before { content: counter(drf-step); position: absolute; left: 0; top: 0.8em; width: 2em; height: 2em; border-radius: 50%; background: var(--drf-grn); color: #fff; font-family: 'Cormorant Garamond', serif; font-weight: 600; font-size: 0.9em; display: flex; align-items: center; justify-content: center; }\n  .drf-steps li:last-child { border-bottom: none; }\n\n  .drf-uses { list-style: none; padding: 0; }\n  .drf-uses li { padding: 0.6em 0; border-bottom: 2px solid var(--drf-gold); }\n  .drf-uses li:nth-child(even) { border-bottom-color: var(--drf-grn); }\n  .drf-uses li:last-child { border-bottom: none; }\n  .drf-uses li strong { color: var(--drf-grn); }\n\n  .drf-compare { margin: 1.2em 0; }\n  .drf-compare-box { border: 1px solid var(--drf-border); padding: 1em 1.2em; margin-bottom: 0.8em; border-radius: 3px; background: var(--drf-grn-light); }\n  .drf-compare-box h4 { margin-top: 0; color: var(--drf-grn); text-transform: none; letter-spacing: 0; font-size: 1.05em; font-family: 'Cormorant Garamond', serif; border-bottom: 2px solid var(--drf-gold); padding-bottom: 0.4em; margin-bottom: 0.6em; }\n\n  .drf-wrap table { width: 100%; border-collapse: collapse; margin: 1.2em 0; font-size: 0.92em; }\n  .drf-wrap table th { background: var(--drf-grn); color: #fff; font-weight: 600; text-align: left; padding: 0.6em 0.8em; font-size: 0.85em; letter-spacing: 0.04em; }\n  .drf-wrap table td { padding: 0.55em 0.8em; border-bottom: 1px solid var(--drf-border); }\n  .drf-wrap table tr:nth-child(even) td { background: var(--drf-grn-light); }\n\n  .drf-faq { border-bottom: 1px solid var(--drf-border); }\n  .drf-faq:last-child { border-bottom: none; }\n  .drf-faq input[type=\"checkbox\"] { display: none; }\n  .drf-faq-q { display: flex; justify-content: space-between; align-items: center; padding: 0.8em 0; cursor: pointer; font-weight: 600; color: var(--drf-grn); font-size: 0.95em; }\n  .drf-faq-q::after { content: '+'; font-size: 1.3em; font-weight: 300; color: var(--drf-gold); width: 1.5em; height: 1.5em; border-radius: 50%; background: var(--drf-grn-light); display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-left: 0.6em; }\n  .drf-faq-a { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; font-size: 0.92em; color: #555; line-height: 1.7; }\n  .drf-faq-a \u003e div { padding: 0 0 1em; }\n  .drf-faq input:checked ~ .drf-faq-q::after { content: '−'; background: var(--drf-grn); color: #fff; }\n  .drf-faq input:checked ~ .drf-faq-a { max-height: 600px; }\n\n  .drf-refs { font-size: 0.78em; color: #888; line-height: 1.5; margin-top: 1.5em; padding-top: 0.8em; border-top: 1px solid var(--drf-border); }\n  .drf-refs ol { padding-left: 1.4em; margin: 0; }\n  .drf-refs li { margin-bottom: 0.3em; }\n  .drf-sep { border: none; border-top: 2px solid var(--drf-gold); margin: 1.5em 0; }\n\u003c\/style\u003e\n\u003cdiv class=\"drf-wrap\"\u003e\n\u003cdiv class=\"drf-tabs-wrap\"\u003e\n\u003cinput checked id=\"drf-gy-tab1\" name=\"drf-gy-tabset\" type=\"radio\"\u003e \u003cinput id=\"drf-gy-tab2\" name=\"drf-gy-tabset\" type=\"radio\"\u003e \u003cinput id=\"drf-gy-tab3\" name=\"drf-gy-tabset\" type=\"radio\"\u003e \u003cinput id=\"drf-gy-tab4\" name=\"drf-gy-tabset\" type=\"radio\"\u003e \u003cinput id=\"drf-gy-tab5\" name=\"drf-gy-tabset\" type=\"radio\"\u003e\n\u003cdiv class=\"drf-tab-labels\"\u003e\n\u003clabel for=\"drf-gy-tab1\"\u003eOverview\u003c\/label\u003e \u003clabel for=\"drf-gy-tab2\"\u003eOrganic vs Synthetic\u003c\/label\u003e \u003clabel for=\"drf-gy-tab3\"\u003eHow to Use\u003c\/label\u003e \u003clabel for=\"drf-gy-tab4\"\u003eThe Science\u003c\/label\u003e \u003clabel for=\"drf-gy-tab5\"\u003eFAQ\u003c\/label\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-panels\"\u003e\n\u003c!-- ═══════════════════════════════════════════════════ --\u003e \u003c!-- TAB 1 — OVERVIEW                                    --\u003e \u003c!-- ═══════════════════════════════════════════════════ --\u003e\n\u003cdiv id=\"drf-gy-panel1\" class=\"drf-panel\"\u003e\n\u003ch2\u003eLiquid Gypsum — Organic Calcium Fertiliser, Clay Soil Conditioner \u0026amp; Lawn Feed\u003c\/h2\u003e\n\u003cdiv class=\"drf-badge-row\"\u003e\n\u003cspan class=\"drf-badge drf-badge-green\"\u003e19.55% Calcium\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003e15.31% Sulphur\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003e5 Micron Particles\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eContains Fulvic Acid\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-gold\"\u003eOrganic Approved\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-gold\"\u003eThick Mineral Suspension\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eLiquid gypsum\u003c\/strong\u003e is the most versatile single bottle in a UK gardener's chemistry. One product does four jobs that usually need four: it is a fast-acting \u003cstrong\u003eorganic calcium fertiliser\u003c\/strong\u003e for tomatoes, peppers and apples prone to blossom end rot and bitter pit; a \u003cstrong\u003eliquid gypsum clay breaker\u003c\/strong\u003e that loosens heavy clay soils without surface disturbance; a \u003cstrong\u003elawn feed\u003c\/strong\u003e that strengthens turf cell walls and improves drainage beneath established grass; and a general source of \u003cstrong\u003eplant-available calcium and sulphur\u003c\/strong\u003e for any fruiting crop, leafy vegetable, perennial border or container plant. The only liquid product on a typical garden shelf that can improve heavy clay \u003cem\u003eunder\u003c\/em\u003e a lawn or border without digging it in.\u003c\/p\u003e\n\u003cp\u003eThis is a \u003cstrong\u003ethick, creamy mineral suspension\u003c\/strong\u003e — not a thin liquid, not a manufactured solution. It is made by wet-milling natural gypsum (calcium sulphate) down to an average particle size of just \u003cstrong\u003e5 microns\u003c\/strong\u003e and suspending those micronised mineral particles in water with \u003cstrong\u003efulvic acid\u003c\/strong\u003e. When you open the bottle, the product is dense, opaque, and settles on standing — because it is real, physical mineral held in suspension. At this particle size, 25 litres of product delivers the same immediately available calcium as \u003cstrong\u003eone tonne of conventional granular gypsum\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThis is the \u003cstrong\u003eorganic version\u003c\/strong\u003e of liquid gypsum — ACO Organic Certified, made from naturally mined calcium sulphate with fulvic acid. No industrial byproduct gypsum, no synthetic dispersants, no manufactured chemical inputs. The fulvic acid enhances calcium uptake through root cell membranes and keeps calcium ions mobile in the soil solution. Not all liquid gypsum is the same — for the difference between organic mineral gypsum and synthetic manufactured liquid gypsum, see the \u003cstrong\u003eOrganic vs Synthetic\u003c\/strong\u003e tab.\u003c\/p\u003e\n\u003cdiv class=\"drf-stats\"\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e19.55%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eCalcium (Ca)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e15.31%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eSulphur (S)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e5μm\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eParticle Size\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e1 tonne\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eEquiv. per 25L\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhat is liquid gypsum used for in the UK garden?\u003c\/h3\u003e\n\u003cul class=\"drf-uses\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlossom end rot prevention \u0026amp; treatment in tomatoes, peppers, courgettes \u0026amp; aubergines\u003c\/strong\u003e — the most responsive treatment for BER; calcium sulphate applied to the root zone begins correcting the calcium delivery failure in expanding fruit within days. Most effective when applied prophylactically from transplant or first flower\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLiquid gypsum for lawns — calcium \u0026amp; sulphur feed plus clay improvement under turf\u003c\/strong\u003e — calcium strengthens grass cell walls for wear tolerance and disease resistance; sulphur supports deeper green colour and protein synthesis; sulphate beneath the surface improves clay structure without digging or lifting the turf. Apply monthly through the growing season, or fortnightly when treating clay\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLiquid gypsum for clay soil — clay breaker \u0026amp; drainage improvement on heavy clay\u003c\/strong\u003e — sulphate displaces sodium and magnesium from clay particles, allowing them to aggregate into a better structure with improved drainage, aeration and root penetration. The only chemical clay breaker that works without altering soil pH\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrganic calcium fertiliser for fruiting crops \u0026amp; container plants\u003c\/strong\u003e — supplies plant-available calcium to any high-demand fruiting crop (apples, pears, strawberries, cucumbers, courgettes), perennial border, rose bed or container without raising soil pH the way lime does. The everyday calcium source for gardeners on already-neutral soils\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBitter pit in apples \u0026amp; pears\u003c\/strong\u003e — calcium deficiency in stored apple fruit is directly corrected by regular liquid gypsum applications from fruit set onwards; improves both fresh eating quality and storage life\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip-burn in leafy crops — lettuce, cabbage, kale\u003c\/strong\u003e — tip-burn is a calcium delivery failure in fast-growing leafy crops; root drenches maintain the constant calcium supply they need\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSulphur supply for sulphur-deficient UK soils\u003c\/strong\u003e — the fourth major crop nutrient, frequently deficient since atmospheric sulphur deposition declined in the 1990s; liquid gypsum delivers immediately available sulphate-sulphur\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCell wall construction in fruiting crops\u003c\/strong\u003e — calcium is a structural component of every new plant cell wall; fruiting crops have extremely high calcium demands during fruit set and fill\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFoliar calcium spray for rapid correction\u003c\/strong\u003e — the micronised suspension can be applied as a foliar spray for rapid calcium delivery directly through the leaf surface\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCalcium fertiliser comparison — liquid gypsum vs lime, which one is right for your soil?\u003c\/h3\u003e\n\u003cdiv class=\"drf-compare\"\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eLiquid Gypsum (Calcium Sulphate)\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eDelivers calcium without meaningfully altering soil pH — suitable for neutral and alkaline soils\u003c\/li\u003e\n\u003cli\u003eSupplies sulphate-sulphur simultaneously — addresses the UK's widespread sulphur deficit\u003c\/li\u003e\n\u003cli\u003eSulphate displaces sodium from clay exchange sites — actively improves soil structure\u003c\/li\u003e\n\u003cli\u003eMicronised to 5 microns — immediately available in the root zone within hours\u003c\/li\u003e\n\u003cli\u003eCombined with fulvic acid for enhanced calcium uptake\u003c\/li\u003e\n\u003cli\u003eACO Organic Certified\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eAgricultural Lime (Calcium Carbonate)\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eSignificantly raises soil pH — useful only where acidity needs correcting\u003c\/li\u003e\n\u003cli\u003eDoes not supply sulphur\u003c\/li\u003e\n\u003cli\u003eNo sodium displacement — does not improve clay structure\u003c\/li\u003e\n\u003cli\u003eReacts slowly; calcium release takes months to years\u003c\/li\u003e\n\u003cli\u003eCan raise pH above optimal range on already-neutral soils\u003c\/li\u003e\n\u003cli\u003eThe correct choice when both acidity and calcium deficiency need addressing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eImportant — what liquid gypsum cannot fix\u003c\/span\u003e\n\u003cp\u003eLiquid gypsum corrects \u003cstrong\u003echemically dispersed clay\u003c\/strong\u003e — where sodium or magnesium has displaced calcium on clay exchange sites, causing particles to collapse into an impermeable layer. It does \u003cem\u003enot\u003c\/em\u003e fix drainage problems caused by \u003cstrong\u003emechanical compaction\u003c\/strong\u003e (foot traffic, machinery, building work) or by a \u003cstrong\u003elack of physical drainage\u003c\/strong\u003e (high water table, impermeable subsoil pan, missing land drains, poor site grading). If water sits on your soil because it has nowhere to drain \u003cem\u003eto\u003c\/em\u003e, no liquid product will resolve that — you need physical drainage infrastructure. See the How to Use tab for diagnostic tests.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ═══════════════════════════════════════════════════ --\u003e \u003c!-- TAB 2 — ORGANIC VS SYNTHETIC                       --\u003e \u003c!-- ═══════════════════════════════════════════════════ --\u003e\n\u003cdiv id=\"drf-gy-panel2\" class=\"drf-panel\"\u003e\n\u003ch2\u003eOrganic vs synthetic liquid gypsum — what is actually in the bottle?\u003c\/h2\u003e\n\u003cp\u003eNot all liquid gypsum is the same. The words \"liquid gypsum\" on a label tell you the product contains calcium sulphate in liquid form — but they tell you nothing about where that calcium sulphate came from, how it was processed, what else is in the bottle, or whether it is suitable for organic growing. There are two fundamentally different types of liquid gypsum on the market, and the distinction matters.\u003c\/p\u003e\n\u003ch3\u003eTwo types of liquid gypsum — what is actually in the bottle\u003c\/h3\u003e\n\u003cdiv class=\"drf-compare\"\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eOrganic Micronised Gypsum (This Product)\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGypsum source:\u003c\/strong\u003e Naturally mined mineral calcium sulphate — quarried from geological deposits of natural gypsum rock\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHow it is made:\u003c\/strong\u003e The natural gypsum is wet-milled (micronised) to an average particle size of 5 microns and suspended in water with fulvic acid — no chemical processing, no synthetic additives\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhysical form:\u003c\/strong\u003e Thick, creamy, opaque suspension that settles on standing — because it contains real mineral particles held in liquid\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdditives:\u003c\/strong\u003e Fulvic acid — a naturally occurring humic substance that chelates calcium and supports soil biology\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e Natural geological gypsum — no industrial contaminants, no heavy metal residues, no fluoride\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrganic status:\u003c\/strong\u003e ACO Organic Certified — permitted in organic production\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoil biology:\u003c\/strong\u003e Fulvic acid actively supports microbial communities; no synthetic surfactants or dispersants\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eSynthetic Manufactured Liquid Gypsum\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGypsum source:\u003c\/strong\u003e Industrial byproduct calcium sulphate — typically from flue gas desulphurisation (FGD gypsum from coal power stations) or phosphoric acid manufacture (phosphogypsum from fertiliser factories)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHow it is made:\u003c\/strong\u003e The industrial byproduct gypsum is dissolved or dispersed using synthetic surfactants, chemical dispersants, and stabilisers to create a pourable liquid product\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhysical form:\u003c\/strong\u003e Often thinner and more uniform than mineral suspensions — synthetic dispersants prevent the natural settling that occurs in genuine micronised mineral products\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdditives:\u003c\/strong\u003e Synthetic surfactants, chemical dispersants, stabilisers, and sometimes polyacrylamide or other manufactured polymers to maintain suspension stability\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e Industrial byproduct gypsum can contain trace contaminants depending on the source process — phosphogypsum may contain fluoride and heavy metal residues; FGD gypsum may contain trace mercury and other flue gas contaminants\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrganic status:\u003c\/strong\u003e Not certified for organic production — synthetic dispersants and industrial byproduct sourcing disqualify it\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoil biology:\u003c\/strong\u003e Synthetic surfactants and dispersants can disrupt soil microbial communities and earthworm activity with repeated use\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eHead-to-head comparison\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eOrganic Micronised Gypsum\u003c\/th\u003e\n\u003cth\u003eSynthetic Liquid Gypsum\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGypsum source\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNaturally mined mineral gypsum\u003c\/td\u003e\n\u003ctd\u003eIndustrial byproduct (FGD or phosphogypsum)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProcessing\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMechanical micronisation only — no chemical processing\u003c\/td\u003e\n\u003ctd\u003eChemical dissolution with synthetic dispersants and surfactants\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eParticle size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5 microns average — extremely high surface area for fast dissolution\u003c\/td\u003e\n\u003ctd\u003eVariable — often coarser or chemically dissolved rather than micronised\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFulvic acid\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIncluded — chelates calcium for enhanced root uptake\u003c\/td\u003e\n\u003ctd\u003eNot included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSynthetic additives\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003ctd\u003eSurfactants, dispersants, stabilisers, sometimes polyacrylamide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eContaminant risk\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNone — natural geological mineral\u003c\/td\u003e\n\u003ctd\u003ePossible trace heavy metals, fluoride depending on industrial source\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrganic approved\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes — ACO Certified\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSoil biology impact\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePositive — fulvic acid feeds beneficial microbes\u003c\/td\u003e\n\u003ctd\u003ePotentially negative — synthetic surfactants can disrupt soil life\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCalcium \u0026amp; sulphur\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e19.55% Ca, 15.31% S\u003c\/td\u003e\n\u003ctd\u003eVariable — depends on manufacturing process and dilution\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eResidual benefit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMineral particles continue dissolving over days after application\u003c\/td\u003e\n\u003ctd\u003eOften pre-dissolved — one-time delivery, gone with the next watering\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eWhere synthetic liquid gypsum comes from\u003c\/h3\u003e\n\u003cp\u003eMost manufactured liquid gypsum is made from \u003cstrong\u003eindustrial byproduct gypsum\u003c\/strong\u003e — calcium sulphate produced as a waste product from other industrial processes, not mined from the ground. The two most common sources are:\u003c\/p\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e01\u003c\/span\u003e\n\u003ch4\u003eFGD Gypsum (Flue Gas Desulphurisation)\u003c\/h4\u003e\n\u003cp\u003eProduced in coal-fired power stations when sulphur dioxide is scrubbed from the exhaust gas using limestone. The resulting calcium sulphate is a synthetic byproduct, not a natural mineral. While chemically similar to natural gypsum, FGD gypsum can contain trace mercury, selenium, and other flue gas contaminants depending on the coal source and scrubbing efficiency.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e02\u003c\/span\u003e\n\u003ch4\u003ePhosphogypsum\u003c\/h4\u003e\n\u003cp\u003eProduced during the manufacture of phosphoric acid from phosphate rock. Phosphogypsum can contain elevated levels of fluoride, cadmium, and naturally occurring radioactive materials (radium-226) from the phosphate ore. Its use in agriculture is restricted or banned in several countries for this reason. Phosphogypsum is significantly cheaper than natural mined gypsum, which is why it is used in manufactured liquid gypsum products where cost is the primary consideration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhy the additives matter\u003c\/h3\u003e\n\u003cp\u003eSynthetic liquid gypsum requires chemical dispersants and surfactants to stay in suspension and pour smoothly. These are industrial chemicals designed to prevent particle settling — they are not there for the benefit of your soil or plants. In an organic micronised gypsum, the product settles naturally because it is real mineral in water with no synthetic stabilisers. You shake it before use, and that is the trade-off for a clean, additive-free product. The fulvic acid in this product is not a dispersant — it is a naturally occurring humic substance included specifically because it chelates calcium for faster plant uptake and supports beneficial soil biology.\u003c\/p\u003e\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eHow to tell what you are buying\u003c\/span\u003e\n\u003cp\u003eCheck the label for the gypsum source. If it does not state \"natural gypsum\" or \"mined gypsum\", the calcium sulphate is likely an industrial byproduct. If the ingredient list includes surfactants, dispersants, polyacrylamide, or other synthetic additives, the product is manufactured rather than organic. If the liquid does not settle or separate on standing, it almost certainly contains synthetic dispersants — a genuine mineral suspension will always settle. If it is not certified organic, it is not organic. This product is ACO Organic Certified, made from naturally mined gypsum, and the only additive is fulvic acid.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eBoth deliver calcium sulphate — so why does the source matter?\u003c\/span\u003e\n\u003cp\u003eBecause you are applying this product to soil you are growing food in, or to a lawn your children and pets use. The calcium sulphate itself is the same molecule regardless of source — but what comes \u003cem\u003ewith\u003c\/em\u003e it is not. Natural mined gypsum is a clean geological mineral with no industrial process residues. Byproduct gypsum carries whatever contaminants were present in the industrial process it came from. And the synthetic surfactants required to keep manufactured liquid gypsum in suspension are additional chemicals being applied to your soil with every treatment. For gardeners building long-term soil health, the source and the additives matter as much as the active ingredient.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ═══════════════════════════════════════════════════ --\u003e \u003c!-- TAB 3 — HOW TO USE                                  --\u003e \u003c!-- ═══════════════════════════════════════════════════ --\u003e\n\u003cdiv id=\"drf-gy-panel3\" class=\"drf-panel\"\u003e\n\u003ch2\u003eHow to apply liquid gypsum — preparation, application rates \u0026amp; UK garden guide\u003c\/h2\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eShake well before every use\u003c\/span\u003e\n\u003cp\u003eThis is a thick mineral suspension, not a clear solution — the micronised gypsum particles settle on standing. Shake or stir vigorously for at least 30 seconds before measuring. If the bottle has been sitting for an extended period, invert and shake several times before use. The thick, creamy consistency when shaken is normal — it is what genuine micronised mineral looks like in liquid form. Do not store in a pre-diluted form — always dilute fresh for each application.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eApplication rates\u003c\/h3\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eRoot drench — general maintenance\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 1 tsp (5 ml) per litre | \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 2–4 weeks\u003c\/div\u003e\n\u003cp\u003eStandard rate for all plants during the growing season. Apply around the root zone, not over the crown. Water in well after application. Compatible with all Dr Forest fertilisers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eRoot drench — active deficiency or high demand\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 2 tsp (10 ml) per litre | \u003cstrong\u003eFrequency:\u003c\/strong\u003e Weekly until resolved, then fortnightly\u003c\/div\u003e\n\u003cp\u003eUse when blossom end rot, bitter pit, or tip-burn is already occurring, or for calcium-hungry crops such as tomatoes, peppers, and apples during rapid fruit fill. Return to the standard rate once symptoms subside.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eFoliar spray — rapid correction\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 5 ml per litre | \u003cstrong\u003eFrequency:\u003c\/strong\u003e Weekly during fruit set and fill\u003c\/div\u003e\n\u003cp\u003eDelivers calcium directly through the leaf and fruit surface for the fastest possible correction of deficiency symptoms. Apply in early morning or evening. Avoid full sun — the suspension may leave a white residue at higher rates. Filter through 200 micron mesh before use in fine spray nozzles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eLawn \u0026amp; turf applications\u003c\/h3\u003e\n\u003cp\u003eLiquid gypsum is one of the most useful products for lawn care — it delivers calcium and sulphur directly into the root zone of established turf without any digging, disruption, or pH change. For professional lawn care and domestic gardeners managing lawns on clay, compacted, or sodium-affected soils, it is a core maintenance input.\u003c\/p\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eLawn — general maintenance\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 10 ml per litre at 1 L\/m² | \u003cstrong\u003eFrequency:\u003c\/strong\u003e Monthly during the growing season (March–October)\u003c\/div\u003e\n\u003cp\u003eStandard lawn rate for ongoing calcium and sulphur supply. Apply with a watering can fitted with a rose, or through a knapsack sprayer. Water in lightly after application. Supports cell wall strength in grass plants, improving wear tolerance, disease resistance, and recovery from foot traffic. The sulphur deepens green colour and supports protein synthesis in the leaf.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eLawn — clay soil improvement\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 15 ml per litre at 1 L\/m² | \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 2 weeks for the first 3 months, then monthly\u003c\/div\u003e\n\u003cp\u003eHigher rate for lawns on heavy clay that drains poorly, puddles after rain, or becomes waterlogged in winter. The sulphate displaces sodium from the clay beneath the turf, gradually improving drainage and aeration without disturbing the lawn surface. This is the only effective way to chemically treat clay under an established lawn — you cannot dig in amendments without destroying the turf. For best results, combine with hollow-tine aeration in autumn to physically open channels into the clay layer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eLawn — after aeration or scarifying\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 10–15 ml per litre at 1 L\/m² | \u003cstrong\u003eFrequency:\u003c\/strong\u003e Immediately after aeration, then monthly\u003c\/div\u003e\n\u003cp\u003eApply immediately after hollow-tine aeration, slit aeration, or scarifying. The open channels and exposed soil allow the liquid gypsum to penetrate directly into the clay layer beneath the turf — dramatically increasing the depth and speed of treatment compared to surface application alone. This is the single most effective timing for clay treatment under lawns.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eLawn — new turf or overseeding\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 10 ml per litre at 1 L\/m² | \u003cstrong\u003eFrequency:\u003c\/strong\u003e At laying\/sowing, then fortnightly for 6 weeks\u003c\/div\u003e\n\u003cp\u003eCalcium supports strong cell wall construction in new grass plants, improving establishment speed and early wear tolerance. The sulphur aids root development. On clay sites, treating the prepared soil surface before laying turf or sowing seed gives new grass the best possible start.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eWhy liquid gypsum is ideal for lawns\u003c\/span\u003e\n\u003cp\u003eMost soil amendments require digging or incorporation — impossible on an established lawn without destroying it. Liquid gypsum is applied to the surface and washes into the root zone with rain or irrigation. It delivers calcium and sulphur directly where the grass roots are, improves clay structure beneath the turf without disturbance, and does not alter soil pH — so it will not affect the balance of grass species in your sward. It is one of the very few products that can meaningfully improve the soil under a lawn without lifting the turf.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eClay soil conditioning\u003c\/h3\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eClay soil — initial treatment (months 1–3)\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 15 ml per litre at 1 L\/m² | \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 2 weeks\u003c\/div\u003e\n\u003cp\u003eApply the full clay conditioning rate fortnightly for the first three months. Water in thoroughly after each application. Apply to the soil surface evenly. Begin in early spring or autumn when the soil is moist and workable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eClay soil — maintenance (month 4 onwards)\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 10 ml per litre at 1 L\/m² | \u003cstrong\u003eFrequency:\u003c\/strong\u003e Monthly\u003c\/div\u003e\n\u003cp\u003eReduce to the monthly maintenance rate once you begin to see improvement in surface drainage or soil workability. Continue throughout the growing season.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eFertigation — drip or trickle\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 5–10 ml per litre | \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 2–4 weeks\u003c\/div\u003e\n\u003cp\u003eAdd to the irrigation reservoir after main nutrient solution. Use a coarse inline filter (500 micron minimum). Not suitable for precision drip emitters with apertures below 500 microns without filtration. Shake product well before adding.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eSpot treatment — individual plants\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 5 ml per litre; 200–500 ml per plant | \u003cstrong\u003eFrequency:\u003c\/strong\u003e Weekly for 2–3 weeks then assess\u003c\/div\u003e\n\u003cp\u003eFor a single plant showing blossom end rot or bitter pit, apply directly around the root zone at the higher volume to saturate the root zone with immediately available calcium.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhen liquid gypsum will and will not help your drainage\u003c\/h3\u003e\n\u003cp\u003eGypsum is a powerful tool for the right problem — but it is not a universal drainage fix. Before applying, you need to understand what is actually causing your waterlogging. There are three distinct causes of poor drainage, and gypsum only addresses one of them.\u003c\/p\u003e\n\u003cdiv class=\"drf-compare\"\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eGypsum WILL help — chemically dispersed clay\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eClay particles have lost the calcium that holds them in open aggregates\u003c\/li\u003e\n\u003cli\u003eSodium or magnesium has displaced calcium on clay exchange sites, causing particles to disperse and pack flat\u003c\/li\u003e\n\u003cli\u003eCommon in gardens with hard water irrigation, high-sodium soils, or where builders have exposed subsoil clay\u003c\/li\u003e\n\u003cli\u003eGypsum's calcium replaces sodium on exchange sites; sulphate converts the sodium to a soluble salt that washes out\u003c\/li\u003e\n\u003cli\u003eDrainage improvement is usually measurable within one season of regular applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eGypsum will NOT help — mechanical compaction\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eSoil structure has been physically destroyed by weight — foot traffic, machinery, vehicles on wet ground\u003c\/li\u003e\n\u003cli\u003eNo chemical amendment can undo mechanical compression — the soil needs physical intervention\u003c\/li\u003e\n\u003cli\u003eThe fix is mechanical: deep forking, broadfork aeration, hollow-tine aeration, or double-digging with organic matter\u003c\/li\u003e\n\u003cli\u003eOnce compaction is physically broken, \u003cem\u003ethen\u003c\/em\u003e gypsum can prevent the clay from re-dispersing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eGypsum will NOT help — inadequate physical drainage\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eIf water has \u003cstrong\u003enowhere to drain to\u003c\/strong\u003e, no soil amendment of any kind will fix the problem\u003c\/li\u003e\n\u003cli\u003eHigh water table — groundwater sits at or near the surface, especially in winter; the soil may be perfectly structured but is simply saturated from below\u003c\/li\u003e\n\u003cli\u003eImpermeable subsoil pan — a natural clay or iron pan layer deep in the soil profile blocks all downward water movement regardless of topsoil condition\u003c\/li\u003e\n\u003cli\u003eMissing land drains — older properties, new-build sites, and gardens on flat terrain may simply lack any drainage infrastructure to carry water away\u003c\/li\u003e\n\u003cli\u003ePoor site grading — water flows towards, not away from, the problem area due to the lie of the land\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe fix is infrastructure:\u003c\/strong\u003e land drains, French drains, soakaways, regrading, or raised beds to lift the growing zone above the water table\u003c\/li\u003e\n\u003cli\u003eApplying liquid gypsum (or any other product) to soil that is waterlogged because there is no drainage outlet is a waste of product and money\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eHow to diagnose your drainage problem\u003c\/h3\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e01\u003c\/span\u003e\n\u003ch4\u003eThe screwdriver test — checking for compaction\u003c\/h4\u003e\n\u003cp\u003ePush a long screwdriver into moist soil. In uncompacted soil, it should push in to at least 15–20 cm with moderate hand pressure. If it meets a hard, resistant layer within 5–10 cm, you have a compaction pan. This is a mechanical problem — gypsum will not fix it. Fork it, broadfork it, or hollow-tine aerate it first.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e02\u003c\/span\u003e\n\u003ch4\u003eThe jar test — checking for dispersed clay\u003c\/h4\u003e\n\u003cp\u003eFill a clean jam jar one-third with soil, fill the rest with water, add a teaspoon of dishwasher salt, and shake vigorously for two minutes. Leave undisturbed for 48 hours. If the water remains cloudy, your clay is chemically dispersed and gypsum will help. To confirm, repeat with a second jar adding a capful of liquid gypsum — if it clears faster, your soil will respond to treatment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e03\u003c\/span\u003e\n\u003ch4\u003eThe hole test — checking for a drainage outlet\u003c\/h4\u003e\n\u003cp\u003eDig a hole 30 cm deep and 30 cm wide in the problem area. Fill it with water and time how long it takes to drain. If the water is still sitting in the hole after 24 hours, you have a fundamental drainage problem — either a high water table, an impermeable subsoil pan, or no drainage gradient. This is not a chemistry problem. No liquid product will fix it. You need physical drainage: land drains, a French drain, a soakaway, or raised beds to lift the growing zone above the saturated layer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e04\u003c\/span\u003e\n\u003ch4\u003eThe ribbon test — confirming clay content\u003c\/h4\u003e\n\u003cp\u003eTake a small lump of moist soil and squeeze it between thumb and forefinger to form a flat ribbon. True clay forms a smooth, shiny ribbon 5 cm or longer. If you cannot form a ribbon, your drainage problem is unlikely to be clay-related — look at subsoil panning, water table, or surface grading instead.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eStep-by-step preparation\u003c\/h3\u003e\n\u003col class=\"drf-steps\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eShake the bottle thoroughly.\u003c\/strong\u003e Invert and shake vigorously for 30 seconds. The product is thick and creamy — this is normal for a mineral suspension. Never measure from an unshaken bottle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasure and mix into a small amount of warm water first.\u003c\/strong\u003e Measure the required amount into a small jug or cup containing a splash of warm water. Stir until the thick suspension is fully dispersed — this ensures a thorough mix with no residue left on the spoon or measuring vessel. The warm water dissolves the mineral paste cleanly off everything it touches.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdd this concentrate to the rest of your water.\u003c\/strong\u003e Pour the pre-mixed concentrate into your watering can or spray container filled with the remaining volume of water. Stir briefly — the suspension will remain stable during normal use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApply to the root zone or foliage.\u003c\/strong\u003e For root drenches, apply evenly around the base and water in. For foliar, filter through fine mesh and apply in early morning or evening.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse fresh — do not store diluted.\u003c\/strong\u003e Prepare only as much as you need for each application and use immediately.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003ePreventing blossom end rot — the timing that matters\u003c\/span\u003e\n\u003cp\u003eBlossom end rot, bitter pit, and tip-burn are most effectively prevented by starting liquid gypsum applications \u003cem\u003ebefore\u003c\/em\u003e symptoms appear. By the time you see the first blackened blossom end, the calcium deficiency occurred 2–3 weeks earlier. Begin root drenches at 1 tsp\/L fortnightly from transplanting or fruit set, and increase to weekly at 2 tsp\/L during rapid fruit expansion. Once symptoms appear, continue at the higher rate and add a weekly foliar spray.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eWorks well combined with…\u003c\/span\u003e\n\u003cp\u003eFor maximum calcium delivery, combine liquid gypsum root drenches with \u003cstrong\u003eFulvic Acid Powder\u003c\/strong\u003e — the fulvic acid chelates calcium ions for faster root uptake. For long-term soil structure building, use \u003cstrong\u003eHumic Acid Granules\u003c\/strong\u003e as a monthly soil drench — humic acid raises soil CEC, helping it hold calcium between applications. On lawns, combine with \u003cstrong\u003eSeaweed Powder\u003c\/strong\u003e drenches for improved root depth and stress tolerance alongside the calcium and sulphur from gypsum.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ═══════════════════════════════════════════════════ --\u003e \u003c!-- TAB 4 — THE SCIENCE                                --\u003e \u003c!-- ═══════════════════════════════════════════════════ --\u003e\n\u003cdiv id=\"drf-gy-panel4\" class=\"drf-panel\"\u003e\n\u003ch2\u003eHow does liquid gypsum work? The science of calcium \u0026amp; sulphur in soil, lawn and fruit\u003c\/h2\u003e\n\u003ch3\u003eCalcium's dual role — soil structure and plant physiology\u003c\/h3\u003e\n\u003cp\u003eCalcium is unusual among plant nutrients in that it is simultaneously critical to soil chemistry and plant biology. In the soil, calcium acts as the primary cation binding clay particles together into stable aggregates — the open, crumb structure that allows drainage, aeration, and root exploration. When calcium is displaced from clay exchange sites by sodium or magnesium, clay particles disperse and the soil structure collapses into a dense, impermeable layer. Restoring calcium to those exchange sites is the mechanism by which gypsum corrects clay soils.\u003c\/p\u003e\n\u003cp\u003eInside the plant, calcium is an \u003cstrong\u003eimmobile structural nutrient\u003c\/strong\u003e — unlike nitrogen or potassium, it cannot be remobilised from older tissue to supply new growth. Every new cell wall requires a fresh supply of calcium delivered by the transpiration stream from the roots. When the rate of new cell production in developing fruit exceeds the rate of calcium delivery — typically during rapid fruit expansion in heat or after irregular watering — the newest cells are formed with deficient cell walls that collapse and die. This is the visible result of blossom end rot and bitter pit: not a shortage of calcium in the soil, but a \u003cem\u003efailure of delivery\u003c\/em\u003e to the fastest-growing tissue.\u003c\/p\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003cdiv class=\"drf-compare\"\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eThe calcium role — Cell walls, soil aggregates \u0026amp; fruit integrity\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eStructural component of every new plant cell wall via the middle lamella\u003c\/li\u003e\n\u003cli\u003eBinds clay particles into stable soil aggregates through electrostatic attraction\u003c\/li\u003e\n\u003cli\u003eImmobile in plants — cannot be translocated from old tissue to new growth\u003c\/li\u003e\n\u003cli\u003eDeficiency always shows in newest, fastest-growing tissue first\u003c\/li\u003e\n\u003cli\u003eCritical during fruit set and rapid fruit fill in all fruiting crops\u003c\/li\u003e\n\u003cli\u003eDelivered as plant-available Ca²⁺ from calcium sulphate dissolution\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eThe sulphate role — Sodium displacement, protein synthesis \u0026amp; soil health\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eFourth major crop nutrient — frequently deficient in UK soils since the 1990s\u003c\/li\u003e\n\u003cli\u003eRequired for cysteine, methionine, and other sulphur-containing amino acids\u003c\/li\u003e\n\u003cli\u003eSulphate displaces sodium from clay exchange sites — the clay-busting mechanism\u003c\/li\u003e\n\u003cli\u003eSodium sulphate formed is soluble and leaches from the root zone with watering\u003c\/li\u003e\n\u003cli\u003eStrongly involved in root development and crop immune function\u003c\/li\u003e\n\u003cli\u003eImmediately available as sulphate-S — no microbial conversion required\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003ch3\u003eWhy does water pool on the surface of clay soils?\u003c\/h3\u003e\n\u003cp\u003eWhen a heavy clay garden floods and stays wet for days, the problem is almost always at the very surface — a hard skin only a millimetre or two thick that water can't get through. The soil below it might be perfectly capable of draining; it just can't be reached. That skin is the \u003cstrong\u003esurface seal\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eHere is how it forms. Clay is made of microscopic flat particles, far too small to see — smaller than a grain of pollen. In a healthy garden these particles stick to each other in small crumbs, and water flows freely between the crumbs through the gaps. When the first heavy rain of the season hits bare clay, raindrops strike with enough force to knock individual particles loose from those crumbs. The loose particles wash into the gaps and clog them. As the surface dries, the trapped particles glue themselves together as a continuous hard crust. The next rain has nowhere to go and pools on top (Agassi, Shainberg \u0026amp; Morin 1981).\u003c\/p\u003e\n\u003cp\u003eWhat decides whether clay particles will stick together properly or fall apart on contact with rainwater is the chemistry sitting on their surfaces. Each clay particle carries a slight negative electrical charge — and just like two negative magnets, two clay particles will push each other apart unless something positively charged is in between to bridge them. \u003cstrong\u003eCalcium does that bridging job better than anything else that naturally occurs in soil.\u003c\/strong\u003e It has the right charge and the right size to sit tightly between adjacent clay particles and hold them together. Sodium and (to a lesser extent) magnesium are weaker bridges — when they take calcium's place on the clay surfaces, the bridges fail, the particles drift apart, and surface sealing begins.\u003c\/p\u003e\n\u003ch3\u003eHow liquid gypsum prevents and reverses the surface seal — three ways it works\u003c\/h3\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e01\u003c\/span\u003e\n\u003ch4\u003eWorking immediately (hours)\u003c\/h4\u003e\n\u003cp\u003eWhen gypsum dissolves it releases two things into the soil water: calcium and sulphate. Both are dissolved minerals, and their presence alone — even before any chemical reaction with the clay — has an immediate physical effect. The level of dissolved minerals in the water is what tells the clay particles whether to drift apart or pull together. Above a certain threshold, dissolved minerals effectively crowd the clay particles back into contact with each other. Liquid gypsum delivers enough dissolved calcium and sulphate to cross that threshold within hours of being watered in. This is why visible improvements in surface drainage often show up after a single rain or watering cycle, long before any deeper soil chemistry has had time to change. The threshold itself was established in foundational soil-physics research from the 1950s (Quirk \u0026amp; Schofield 1955).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e02\u003c\/span\u003e\n\u003ch4\u003eLasting fix (weeks to months)\u003c\/h4\u003e\n\u003cp\u003eOver the following weeks the calcium from the dissolved gypsum slowly displaces the troublemaking sodium and excess magnesium that were sitting on the clay surfaces in the first place. Calcium has a stronger natural attraction to clay than either of those, so it wins these slow swaps every time. As calcium takes its proper place between clay particles, the bridges that hold the soil together are physically restored. The crumb structure rebuilds itself from the surface downwards. This is the slower of the two effects but it is what actually fixes the soil rather than just suppressing the symptom.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e03\u003c\/span\u003e\n\u003ch4\u003eFlushing out the troublemakers\u003c\/h4\u003e\n\u003cp\u003eWhen calcium kicks sodium or magnesium off the clay surfaces, those displaced minerals are now floating loose in the soil water. If left there they would simply re-attach. This is where the sulphate part of gypsum matters. Sulphate combines with sodium to make a highly water-soluble salt that gets washed downwards and out of the root zone with every rainfall. Over the course of a growing season the soil's chemistry shifts permanently toward a healthier calcium-dominated state. Agricultural lime — the cheaper calcium source — contains no sulphate, which is why it significantly underperforms gypsum on heavy clay despite being a less expensive way to deliver the calcium itself.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eWhy this works faster than granular gypsum\u003c\/span\u003e\n\u003cp\u003eStandard agricultural gypsum is sold as granules. Spread on the surface of a lawn or border, granules dissolve very slowly — much of the product sits inert for weeks while only the outermost surface releases any calcium. Research from 1981 showed that how quickly the gypsum dissolves at the soil surface is the single biggest factor in how well it actually works against surface sealing — slow-dissolving granules are simply not effective at the surface (Keren \u0026amp; Shainberg 1981). This product is wet-milled down to particles only five thousandths of a millimetre across (5 microns) and supplied already mixed into water as a thick suspension. Once it touches wet soil it is essentially dissolved within hours. The immediate effect described above is delivered exactly where the seal forms, exactly when rainfall arrives.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eHow liquid gypsum stops water pooling on UK clay soil\u003c\/h3\u003e\n\u003cp\u003eThe science above was originally worked out for salt-affected soils in Australia, the Mediterranean and the American west, where irrigation water has carried high levels of sodium into garden soils for decades. UK gardens don't usually have a sodium problem. But the same surface pooling still affects millions of British clay gardens — and the fix is the same.\u003c\/p\u003e\n\u003cp\u003eThere are two reasons UK clay still disperses and seals at the surface, even without high sodium.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMagnesium imbalance.\u003c\/strong\u003e Most UK clay garden soils — the heavy, sticky soils that turn rock-hard in summer and waterlogged in winter — are dominated by a clay mineral called illite, often mixed with smectite. These minerals are particularly sensitive to the balance of calcium and magnesium sitting on their surfaces. When magnesium starts to outweigh calcium (the rule of thumb is anything below roughly a 3-to-1 calcium-to-magnesium ratio), the magnesium plays the same disruptive role that sodium plays in Australian clays: it weakens the bonds holding clay particles together, the particles disperse, and the surface seals up. Same problem, milder intensity, same fix (Curtin et al. 1994; Dontsova \u0026amp; Norton 2002).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCompaction.\u003c\/strong\u003e Walking on wet ground, digging when the soil is too damp, the legacy of building work or trenching — anything that physically crushes the soil's natural crumb structure flat against the surface. The crushed clay at the surface is now exposed raw to every rainfall and disperses on contact, even when the chemistry beneath it is healthy. This is why a trampled lawn or path edge pools water more than an undisturbed border: it has lost its surface structure.\u003c\/p\u003e\n\u003cp\u003eEither cause produces the same visible problem. Rainwater that should soak in instead sits on the surface for hours or days, then runs off into the lowest corner of the garden. The lawn squelches underfoot. The vegetable bed turns into a shallow pond after every heavy shower. The roots underneath sit in stagnant water with no oxygen.\u003c\/p\u003e\n\u003cp\u003eLiquid gypsum fixes both versions of the problem the same way it fixes the textbook sodium version. The calcium it releases doesn't care which troublemaking mineral it has to displace — sodium or magnesium, either one. The sulphate doesn't care either — it combines with whatever was displaced and washes it down out of the root zone with the next rainfall. And the sudden boost of dissolved minerals in the water (the \"Working immediately\" card above) crowds the loose clay particles back together within hours, regardless of what was keeping them apart.\u003c\/p\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003ch3\u003eSix mechanisms of action\u003c\/h3\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e01\u003c\/span\u003e\n\u003ch4\u003eCell Wall Construction\u003c\/h4\u003e\n\u003cp\u003eCalcium is the primary component of the middle lamella — the layer between plant cells that determines cell wall integrity and firmness. Every rapidly dividing cell in a developing fruit, leaf, or root tip requires a continuous supply of calcium. Liquid gypsum delivers calcium sulphate directly into the root zone in immediately absorbable form, maintaining the rate of calcium supply needed to match fast cell division during fruit set and fill.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e02\u003c\/span\u003e\n\u003ch4\u003eClay Flocculation \u0026amp; Soil Structure\u003c\/h4\u003e\n\u003cp\u003eClay particles carry a negative surface charge that is normally balanced by calcium ions — keeping them aggregated into stable crumbs. When sodium or magnesium displaces calcium from these exchange sites, clay particles disperse and pack tightly, destroying soil structure. Calcium sulphate restores calcium to those exchange sites while sulphate reacts with displaced sodium to form sodium sulphate — a soluble salt that leaches out with watering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e03\u003c\/span\u003e\n\u003ch4\u003eSodium Displacement\u003c\/h4\u003e\n\u003cp\u003eIn gardens irrigated with hard water, or where soils have a history of sodium accumulation, liquid gypsum provides the fastest practical method of sodium management. The calcium from gypsum displaces sodium from clay exchange sites; the sulphate converts the free sodium to soluble sodium sulphate; regular watering then leaches the sodium sulphate below the root zone. This process can measurably improve soil tilth within a single season of regular applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e04\u003c\/span\u003e\n\u003ch4\u003eSulphur as Protein Builder\u003c\/h4\u003e\n\u003cp\u003eSulphur is essential for the synthesis of cysteine, methionine, and other sulphur-containing amino acids that are the building blocks of plant proteins, enzymes, and glucosinolates. UK soils have been consistently sulphur-deficient since atmospheric deposition from industrial emissions declined in the 1990s. Gypsum delivers immediately available sulphate-sulphur that requires no microbial conversion before root uptake — the fastest-acting sulphur source available in organic gardening.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e05\u003c\/span\u003e\n\u003ch4\u003eFulvic Acid Enhanced Uptake\u003c\/h4\u003e\n\u003cp\u003eThe fulvic acid included in this formulation chelates the calcium ions in solution, keeping them mobile and preventing precipitation when the product is mixed with other inputs or applied to alkaline soils. Fulvic acid also increases the permeability of root cell membranes, improving the rate at which calcium and sulphate ions are actively absorbed. The result is measurably faster and more complete uptake compared to unfulficated calcium sulphate suspensions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e06\u003c\/span\u003e\n\u003ch4\u003eFruit Quality \u0026amp; Shelf Life\u003c\/h4\u003e\n\u003cp\u003eCalcium is the principal determinant of fruit firmness: adequate calcium in developing fruit cell walls produces firm, dense tissue that resists bruising, breakdown, and post-harvest decay. Regular liquid gypsum applications during fruit set and fill consistently improve the firmness and shelf life of tomatoes, peppers, apples, strawberries, and other calcium-sensitive crops — extending the window for harvest, storage, and sale.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-refs\"\u003e\n\u003ch4\u003eScientific References\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003eBangerth, F. (1979). Calcium-related physiological disorders of plants. \u003cem\u003eAnnual Review of Phytopathology\u003c\/em\u003e, 17, 97–122.\u003c\/li\u003e\n\u003cli\u003eHo, L.C. \u0026amp; White, P.J. (2005). A cellular hypothesis for the induction of blossom-end rot in tomato fruit. \u003cem\u003eAnnals of Botany\u003c\/em\u003e, 95(4), 571–581.\u003c\/li\u003e\n\u003cli\u003eWhite, P.J. \u0026amp; Broadley, M.R. (2003). Calcium in plants. \u003cem\u003eAnnals of Botany\u003c\/em\u003e, 92(4), 487–511.\u003c\/li\u003e\n\u003cli\u003eBronick, C.J. \u0026amp; Lal, R. (2005). Soil structure and management: a review. \u003cem\u003eGeoderma\u003c\/em\u003e, 124(1–2), 3–22.\u003c\/li\u003e\n\u003cli\u003eTisdale, S.L. et al. (1993). \u003cem\u003eSoil Fertility and Fertilizers\u003c\/em\u003e (5th ed.). Macmillan. [Sulphur nutrition in plants]\u003c\/li\u003e\n\u003cli\u003eCanellas, L.P. \u0026amp; Olivares, F.L. (2014). Physiological responses to humic substances as plant growth promoters. \u003cem\u003eChemical and Biological Technologies in Agriculture\u003c\/em\u003e, 1(1), 3.\u003c\/li\u003e\n\u003cli\u003eRengasamy, P. \u0026amp; Olsson, K.A. (1991). Sodicity and soil structure. \u003cem\u003eAustralian Journal of Soil Research\u003c\/em\u003e, 29(6), 935–952.\u003c\/li\u003e\n\u003cli\u003eQadir, M. et al. (2001). Amelioration strategies for sodic soils. \u003cem\u003eLand Degradation \u0026amp; Development\u003c\/em\u003e, 12(4), 357–386.\u003c\/li\u003e\n\u003cli\u003eQuirk, J.P. \u0026amp; Schofield, R.K. (1955). The effect of electrolyte concentration on soil permeability. \u003cem\u003eJournal of Soil Science\u003c\/em\u003e, 6(2), 163–178.\u003c\/li\u003e\n\u003cli\u003eAgassi, M., Shainberg, I. \u0026amp; Morin, J. (1981). Effect of electrolyte concentration and soil sodicity on infiltration rate and crust formation. \u003cem\u003eSoil Science Society of America Journal\u003c\/em\u003e, 45(5), 848–851.\u003c\/li\u003e\n\u003cli\u003eKeren, R. \u0026amp; Shainberg, I. (1981). Effect of dissolution rate on the efficiency of industrial and mined gypsum in improving infiltration of a sodic soil. \u003cem\u003eSoil Science Society of America Journal\u003c\/em\u003e, 45(1), 103–107.\u003c\/li\u003e\n\u003cli\u003eShainberg, I. \u0026amp; Letey, J. (1984). Response of soils to sodic and saline conditions. \u003cem\u003eHilgardia\u003c\/em\u003e, 52(2), 1–57.\u003c\/li\u003e\n\u003cli\u003eCurtin, D., Steppuhn, H. \u0026amp; Selles, F. (1994). Effects of magnesium on cation selectivity and structural stability of sodic soils. \u003cem\u003eSoil Science Society of America Journal\u003c\/em\u003e, 58(3), 730–737.\u003c\/li\u003e\n\u003cli\u003eDontsova, K. \u0026amp; Norton, L.D. (2002). Clay dispersion, infiltration and erosion as influenced by exchangeable Ca and Mg. \u003cem\u003eSoil Science\u003c\/em\u003e, 167(3), 184–193.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ═══════════════════════════════════════════════════ --\u003e \u003c!-- TAB 5 — FAQ                                        --\u003e \u003c!-- ═══════════════════════════════════════════════════ --\u003e\n\u003cdiv id=\"drf-gy-panel5\" class=\"drf-panel\"\u003e\n\u003ch2\u003eLiquid gypsum FAQ — what it is, how to apply it, and which questions UK gardeners ask most\u003c\/h2\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-gy-faq1\" type=\"checkbox\"\u003e\u003clabel for=\"drf-gy-faq1\" class=\"drf-faq-q\"\u003eWhy is this product thick and creamy rather than a clear liquid?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eBecause it is a genuine mineral suspension, not a manufactured liquid. Natural gypsum rock has been wet-milled down to 5 micron particles and suspended in water with fulvic acid. Those mineral particles are physically present in the liquid — which is why it is opaque, dense, and settles on standing. Synthetic liquid gypsum products are made from industrial byproduct calcium sulphate processed with chemical dispersants and surfactants — they may appear thinner or more uniform because those synthetic additives prevent natural settling. The thick consistency of this product is what real micronised natural mineral looks like in liquid form, and the settling is proof that no synthetic dispersants have been added.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-gy-faq2\" type=\"checkbox\"\u003e\u003clabel for=\"drf-gy-faq2\" class=\"drf-faq-q\"\u003eWhy is my soil calcium level fine but I still get blossom end rot?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eBecause blossom end rot is a delivery problem, not a supply problem. Calcium is immobile in plants — it travels only upward through the transpiration stream and cannot be moved from old tissue to new. Developing fruit at the blossom end are dividing cells faster than almost anywhere else in the plant. Any disruption to calcium flow — hot weather, irregular watering, root damage — causes the newest cells to form with inadequate calcium. Those cells collapse and die. Increasing the concentration of immediately available calcium in the root zone with regular liquid gypsum drenches maintains the supply rate and prevents the deficit.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-gy-faq3\" type=\"checkbox\"\u003e\u003clabel for=\"drf-gy-faq3\" class=\"drf-faq-q\"\u003eWhat is the difference between this and synthetic liquid gypsum?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eThis product is made from naturally mined gypsum, micronised to 5 microns and suspended in water with fulvic acid — no synthetic additives, no industrial byproduct gypsum, no chemical dispersants. Most other liquid gypsum products on the market are made from industrial byproduct calcium sulphate — typically FGD gypsum from coal power stations or phosphogypsum from fertiliser manufacture — processed with synthetic surfactants and dispersants to create a pourable liquid. The differences matter: natural mined gypsum is a clean geological mineral with no process contaminants; byproduct gypsum can carry trace heavy metals and other residues from the industrial process it came from. This product is ACO Organic Certified; synthetic manufactured liquid gypsum is not. See the Organic vs Synthetic tab for the full comparison.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-gy-faq4\" type=\"checkbox\"\u003e\u003clabel for=\"drf-gy-faq4\" class=\"drf-faq-q\"\u003eWhy use liquid gypsum rather than lime for calcium?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eLime significantly raises soil pH, which is often undesirable on already-neutral or slightly alkaline soils. Gypsum supplies calcium without meaningfully changing soil pH. The micronised suspension delivers calcium in immediately available form, not over months. Gypsum also supplies sulphate-sulphur and the sulphate component actively displaces sodium from clay. If your soil is both acid and calcium deficient, lime corrects both. If your soil is already at the right pH, liquid gypsum is the appropriate calcium source.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-gy-faq5\" type=\"checkbox\"\u003e\u003clabel for=\"drf-gy-faq5\" class=\"drf-faq-q\"\u003eIs liquid gypsum good for lawns?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eYes — it is one of the most practical lawn care inputs available. Calcium strengthens grass cell walls, improving wear tolerance and disease resistance. Sulphur supports protein synthesis and deepens green colour. On clay lawns, the sulphate displaces sodium from the clay beneath the turf, gradually improving drainage and aeration without disturbing the surface. Apply monthly at 10 ml\/L at 1 L\/m² as standard maintenance, or at 15 ml\/L fortnightly for active clay treatment. The best results come from applying immediately after hollow-tine aeration, when the open channels allow the product to penetrate directly into the clay layer.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-gy-faq6\" type=\"checkbox\"\u003e\u003clabel for=\"drf-gy-faq6\" class=\"drf-faq-q\"\u003eWill liquid gypsum fix my waterlogged garden?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eOnly if the waterlogging is caused by chemically dispersed clay — where sodium has displaced calcium on clay exchange sites, causing the particles to pack into an impermeable layer. Gypsum will not fix waterlogging caused by mechanical compaction (foot traffic, machinery), a high water table, an impermeable subsoil pan, missing land drains, or poor site grading. If water sits on your soil because it has nowhere to drain to, no liquid product will fix that — you need physical drainage infrastructure. Use the diagnostic tests in the How to Use tab to identify your specific problem before purchasing.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-gy-faq7\" type=\"checkbox\"\u003e\u003clabel for=\"drf-gy-faq7\" class=\"drf-faq-q\"\u003eWill it leave a white residue on my plants?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eAt standard root drench rates there is no visible residue. Applied as a foliar spray at higher concentrations, the product can leave a fine white mineral deposit on leaves — this is the micronised gypsum itself and is harmless. Apply in early morning so the residue dries and blends in. Any residue washes off with rain or irrigation.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-gy-faq8\" type=\"checkbox\"\u003e\u003clabel for=\"drf-gy-faq8\" class=\"drf-faq-q\"\u003eHow does the 2 tsp rate differ from the 1 tsp rate?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eThe 1 tsp\/L (5 ml\/L) rate is a maintenance dose for regular fortnightly applications. The 2 tsp\/L (10 ml\/L) rate is a corrective dose for use when deficiency symptoms are already showing or during rapid fruit fill. It delivers twice the calcium per watering. There is no phytotoxicity risk at either rate — calcium sulphate is a benign mineral with no phytotoxic threshold at garden application levels.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-gy-faq9\" type=\"checkbox\"\u003e\u003clabel for=\"drf-gy-faq9\" class=\"drf-faq-q\"\u003eWhich crops benefit most from liquid gypsum?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eAny rapidly fruiting crop with high calcium demand. The most responsive are tomatoes, peppers, aubergines, apples, pears, strawberries, courgettes, cucumbers, and leafy brassicas. Root crops benefit from the sulphur. Lawns benefit from the calcium (wear tolerance) and sulphur (green colour, protein synthesis), and from the clay-improving action beneath the turf. For roses and flowering plants, calcium supports firm, well-formed flowers and strengthens stems.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-gy-faq10\" type=\"checkbox\"\u003e\u003clabel for=\"drf-gy-faq10\" class=\"drf-faq-q\"\u003eIs it safe for organic growing and edible crops?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eYes. This product is certified for use in organic agriculture by the Australian Certified Organic (ACO) programme. Calcium sulphate is a naturally occurring mineral with no synthetic chemistry, no toxicity to soil organisms, and no withholding period for edible crops. Once the drench has been absorbed or the foliar spray has dried, the garden is safe for pets and children as normal.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-gy-faq11\" type=\"checkbox\"\u003e\u003clabel for=\"drf-gy-faq11\" class=\"drf-faq-q\"\u003eCan I use this in hard water areas?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eYes — and it is particularly valuable in hard water areas. The sulphate from liquid gypsum helps displace sodium and excess magnesium that accumulate with repeated hard water irrigation, and the immediately available calcium in sulphate form is more easily taken up by plants than the carbonate calcium from the water itself.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-gy-faq12\" type=\"checkbox\"\u003e\u003clabel for=\"drf-gy-faq12\" class=\"drf-faq-q\"\u003eHow should I store liquid gypsum?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eStore in a cool, dry place out of direct sunlight. Tested safe down to 5°C — sedimentation may occur below this temperature but is reversible on warming and shaking. Do not allow to freeze. Store in the original container — do not pre-dilute. Shake well before each use. Shelf life is at least 12 months from manufacture when stored correctly.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ═══════════════ INLINE STRUCTURED DATA (Product + FAQPage + HowTo) ═══════════════ --\u003e \u003c!-- Embedded JSON-LD travels with the product description. Do NOT paste these schemas separately elsewhere. --\u003e \u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"FAQPage\",\n      \"@id\": \"https:\/\/www.drforest.co.uk\/products\/liquid-gypsum-micronised-calcium-sulphate#faq\",\n      \"about\": {\n        \"@id\": \"https:\/\/www.drforest.co.uk\/products\/liquid-gypsum-micronised-calcium-sulphate#product\"\n      },\n      \"mainEntity\": [\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Why is this product thick and creamy rather than a clear liquid?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Because it is a genuine mineral suspension, not a manufactured liquid. Natural gypsum rock has been wet-milled down to 5 micron particles and suspended in water with fulvic acid. Those mineral particles are physically present in the liquid — which is why it is opaque, dense, and settles on standing. Synthetic liquid gypsum products are made from industrial byproduct calcium sulphate processed with chemical dispersants and surfactants — they may appear thinner or more uniform because those synthetic additives prevent natural settling. The thick consistency of this product is what real micronised natural mineral looks like in liquid form, and the settling is proof that no synthetic dispersants have been added.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Why is my soil calcium level fine but I still get blossom end rot?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Because blossom end rot is a delivery problem, not a supply problem. Calcium is immobile in plants — it travels only upward through the transpiration stream and cannot be moved from old tissue to new. Developing fruit at the blossom end are dividing cells faster than almost anywhere else in the plant. Any disruption to calcium flow — hot weather, irregular watering, root damage — causes the newest cells to form with inadequate calcium. Those cells collapse and die. Increasing the concentration of immediately available calcium in the root zone with regular liquid gypsum drenches maintains the supply rate and prevents the deficit.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"What is the difference between this and synthetic liquid gypsum?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"This product is made from naturally mined gypsum, micronised to 5 microns and suspended in water with fulvic acid — no synthetic additives, no industrial byproduct gypsum, no chemical dispersants. Most other liquid gypsum products on the market are made from industrial byproduct calcium sulphate — typically FGD gypsum from coal power stations or phosphogypsum from fertiliser manufacture — processed with synthetic surfactants and dispersants to create a pourable liquid. The differences matter: natural mined gypsum is a clean geological mineral with no process contaminants; byproduct gypsum can carry trace heavy metals and other residues from the industrial process it came from. This product is ACO Organic Certified; synthetic manufactured liquid gypsum is not. See the Organic vs Synthetic tab for the full comparison.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Why use liquid gypsum rather than lime for calcium?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Lime significantly raises soil pH, which is often undesirable on already-neutral or slightly alkaline soils. Gypsum supplies calcium without meaningfully changing soil pH. The micronised suspension delivers calcium in immediately available form, not over months. Gypsum also supplies sulphate-sulphur and the sulphate component actively displaces sodium from clay. If your soil is both acid and calcium deficient, lime corrects both. If your soil is already at the right pH, liquid gypsum is the appropriate calcium source.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Is liquid gypsum good for lawns?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Yes — it is one of the most practical lawn care inputs available. Calcium strengthens grass cell walls, improving wear tolerance and disease resistance. Sulphur supports protein synthesis and deepens green colour. On clay lawns, the sulphate displaces sodium from the clay beneath the turf, gradually improving drainage and aeration without disturbing the surface. Apply monthly at 10 ml\/L at 1 L\/m² as standard maintenance, or at 15 ml\/L fortnightly for active clay treatment. The best results come from applying immediately after hollow-tine aeration, when the open channels allow the product to penetrate directly into the clay layer.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Will liquid gypsum fix my waterlogged garden?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Only if the waterlogging is caused by chemically dispersed clay — where sodium has displaced calcium on clay exchange sites, causing the particles to pack into an impermeable layer. Gypsum will not fix waterlogging caused by mechanical compaction (foot traffic, machinery), a high water table, an impermeable subsoil pan, missing land drains, or poor site grading. If water sits on your soil because it has nowhere to drain to, no liquid product will fix that — you need physical drainage infrastructure. Use the diagnostic tests in the How to Use tab to identify your specific problem before purchasing.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Will it leave a white residue on my plants?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"At standard root drench rates there is no visible residue. Applied as a foliar spray at higher concentrations, the product can leave a fine white mineral deposit on leaves — this is the micronised gypsum itself and is harmless. Apply in early morning so the residue dries and blends in. Any residue washes off with rain or irrigation.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"How does the 2 tsp rate differ from the 1 tsp rate?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"The 1 tsp\/L (5 ml\/L) rate is a maintenance dose for regular fortnightly applications. The 2 tsp\/L (10 ml\/L) rate is a corrective dose for use when deficiency symptoms are already showing or during rapid fruit fill. It delivers twice the calcium per watering. There is no phytotoxicity risk at either rate — calcium sulphate is a benign mineral with no phytotoxic threshold at garden application levels.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Which crops benefit most from liquid gypsum?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Any rapidly fruiting crop with high calcium demand. The most responsive are tomatoes, peppers, aubergines, apples, pears, strawberries, courgettes, cucumbers, and leafy brassicas. Root crops benefit from the sulphur. Lawns benefit from the calcium (wear tolerance) and sulphur (green colour, protein synthesis), and from the clay-improving action beneath the turf. For roses and flowering plants, calcium supports firm, well-formed flowers and strengthens stems.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Is it safe for organic growing and edible crops?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Yes. This product is certified for use in organic agriculture by the Australian Certified Organic (ACO) programme. Calcium sulphate is a naturally occurring mineral with no synthetic chemistry, no toxicity to soil organisms, and no withholding period for edible crops. Once the drench has been absorbed or the foliar spray has dried, the garden is safe for pets and children as normal.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Can I use this in hard water areas?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Yes — and it is particularly valuable in hard water areas. The sulphate from liquid gypsum helps displace sodium and excess magnesium that accumulate with repeated hard water irrigation, and the immediately available calcium in sulphate form is more easily taken up by plants than the carbonate calcium from the water itself.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"How should I store liquid gypsum?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Store in a cool, dry place out of direct sunlight. Tested safe down to 5°C — sedimentation may occur below this temperature but is reversible on warming and shaking. Do not allow to freeze. Store in the original container — do not pre-dilute. Shake well before each use. Shelf life is at least 12 months from manufacture when stored correctly.\"\n          }\n        }\n      ]\n    },\n    {\n      \"@type\": \"HowTo\",\n      \"@id\": \"https:\/\/www.drforest.co.uk\/products\/liquid-gypsum-micronised-calcium-sulphate#howto\",\n      \"name\": \"How to apply liquid gypsum — preparation, application rates and crop guide\",\n      \"description\": \"Application rates and methods for premium organic liquid gypsum (19.55% calcium, 15.31% sulphur, 5 micron particle size). Covers preparation, root drench, foliar spray, lawn applications (including liquid gypsum for lawns on clay), clay soil conditioning, fertigation and spot treatment for blossom end rot. Always shake bottle thoroughly before use — the suspension settles on standing and must be re-dispersed before measuring.\",\n      \"about\": {\n        \"@id\": \"https:\/\/www.drforest.co.uk\/products\/liquid-gypsum-micronised-calcium-sulphate#product\"\n      },\n      \"supply\": [\n        {\n          \"@type\": \"HowToSupply\",\n          \"name\": \"Liquid Gypsum (19.55% Ca, 15.31% S micronised mineral suspension)\"\n        },\n        {\n          \"@type\": \"HowToSupply\",\n          \"name\": \"Water (room temperature, with a small amount of warm water for the initial mix)\"\n        }\n      ],\n      \"tool\": [\n        {\n          \"@type\": \"HowToTool\",\n          \"name\": \"Measuring spoon (5 ml \/ 1 tsp) or syringe\"\n        },\n        {\n          \"@type\": \"HowToTool\",\n          \"name\": \"Small jug or cup for pre-mixing\"\n        },\n        {\n          \"@type\": \"HowToTool\",\n          \"name\": \"Watering can or knapsack sprayer (with 200-500 micron filter for foliar)\"\n        }\n      ],\n      \"step\": [\n        {\n          \"@type\": \"HowToSection\",\n          \"name\": \"Preparation\",\n          \"itemListElement\": [\n            {\n              \"@type\": \"HowToStep\",\n              \"name\": \"Shake the bottle thoroughly\",\n              \"text\": \"Invert and shake vigorously for 30 seconds. The product is thick and creamy — this is normal for a mineral suspension. Never measure from an unshaken bottle, or the dose will be inconsistent.\"\n            },\n            {\n              \"@type\": \"HowToStep\",\n              \"name\": \"Pre-mix into warm water\",\n              \"text\": \"Measure the required amount into a small jug or cup containing a splash of warm water. Stir until the thick suspension is fully dispersed — this ensures a thorough mix with no residue left on the spoon or measuring vessel. The warm water dissolves the mineral paste cleanly off everything it touches.\"\n            },\n            {\n              \"@type\": \"HowToStep\",\n              \"name\": \"Add concentrate to the rest of the water\",\n              \"text\": \"Pour the pre-mixed concentrate into your watering can or spray container filled with the remaining volume of water. Stir briefly — the suspension will remain stable during normal use.\"\n            },\n            {\n              \"@type\": \"HowToStep\",\n              \"name\": \"Apply to root zone or foliage\",\n              \"text\": \"For root drenches, apply evenly around the base of the plant and water in. For foliar sprays, filter through fine mesh first and apply in early morning or evening, never in direct sun.\"\n            },\n            {\n              \"@type\": \"HowToStep\",\n              \"name\": \"Use fresh — do not store diluted\",\n              \"text\": \"Prepare only as much working solution as you need for each application and use immediately. Do not pre-dilute and store; mix fresh every time.\"\n            }\n          ]\n        },\n        {\n          \"@type\": \"HowToSection\",\n          \"name\": \"General application rates\",\n          \"itemListElement\": [\n            {\n              \"@type\": \"HowToStep\",\n              \"name\": \"Root drench — general maintenance\",\n              \"text\": \"1 tsp (5 ml) per litre of water, every 2–4 weeks during the growing season. Apply around the root zone, not over the crown. Water in well after application. Standard rate for all plants — compatible with all Dr Forest fertilisers.\"\n            },\n            {\n              \"@type\": \"HowToStep\",\n              \"name\": \"Root drench — active deficiency or high demand\",\n              \"text\": \"2 tsp (10 ml) per litre, weekly until symptoms resolve, then return to fortnightly. Use when blossom end rot, bitter pit or tip-burn is already occurring, or during rapid fruit fill in tomatoes, peppers and apples.\"\n            },\n            {\n              \"@type\": \"HowToStep\",\n              \"name\": \"Foliar spray — rapid calcium correction\",\n              \"text\": \"5 ml per litre of water, weekly during fruit set and fill. Filter through 200 micron mesh before use. Apply in early morning or evening — avoid full sun, which can cause the suspension to leave a white residue on leaves. Delivers calcium directly through the leaf and fruit surface for the fastest possible correction.\"\n            }\n          ]\n        },\n        {\n          \"@type\": \"HowToSection\",\n          \"name\": \"Lawn and turf\",\n          \"itemListElement\": [\n            {\n              \"@type\": \"HowToStep\",\n              \"name\": \"Lawn — general maintenance\",\n              \"text\": \"10 ml per litre at 1 L\/m², monthly during the growing season (March–October). Apply with a watering can fitted with a rose, or through a knapsack sprayer. Water in lightly after application. Supports cell wall strength in grass plants, improving wear tolerance, disease resistance and recovery from foot traffic. The sulphur deepens green colour.\"\n            },\n            {\n              \"@type\": \"HowToStep\",\n              \"name\": \"Lawn on clay — soil improvement\",\n              \"text\": \"15 ml per litre at 1 L\/m², every 2 weeks for the first 3 months, then monthly. Higher rate for lawns on heavy clay that drains poorly or waterlogs in winter. The sulphate displaces sodium from the clay beneath the turf, gradually improving drainage and aeration without disturbing the lawn surface. Combine with hollow-tine aeration in autumn for best results.\"\n            },\n            {\n              \"@type\": \"HowToStep\",\n              \"name\": \"Lawn — after aeration or scarifying\",\n              \"text\": \"10–15 ml per litre at 1 L\/m², immediately after aeration, then monthly. The open channels and exposed soil from hollow-tine aeration, slit aeration or scarifying allow the liquid gypsum to penetrate directly into the clay layer beneath the turf — the single most effective timing for clay treatment under lawns.\"\n            },\n            {\n              \"@type\": \"HowToStep\",\n              \"name\": \"New turf or overseeding\",\n              \"text\": \"10 ml per litre at 1 L\/m² at laying or sowing, then fortnightly for 6 weeks. Calcium supports strong cell wall construction in new grass plants, improving establishment speed and early wear tolerance. The sulphur aids root development. On clay sites, treat the prepared soil surface before laying turf or sowing seed.\"\n            }\n          ]\n        },\n        {\n          \"@type\": \"HowToSection\",\n          \"name\": \"Clay soil conditioning\",\n          \"itemListElement\": [\n            {\n              \"@type\": \"HowToStep\",\n              \"name\": \"Clay soil — initial treatment (months 1–3)\",\n              \"text\": \"15 ml per litre at 1 L\/m², every 2 weeks. Apply the full clay conditioning rate fortnightly for the first three months. Water in thoroughly. Apply to the soil surface evenly. Begin in early spring or autumn when the soil is moist and workable.\"\n            },\n            {\n              \"@type\": \"HowToStep\",\n              \"name\": \"Clay soil — maintenance (month 4 onwards)\",\n              \"text\": \"10 ml per litre at 1 L\/m², monthly. Reduce to the maintenance rate once you begin to see improvement in surface drainage or soil workability. Continue throughout the growing season.\"\n            }\n          ]\n        },\n        {\n          \"@type\": \"HowToSection\",\n          \"name\": \"Fertigation and spot treatment\",\n          \"itemListElement\": [\n            {\n              \"@type\": \"HowToStep\",\n              \"name\": \"Fertigation — drip or trickle irrigation\",\n              \"text\": \"5–10 ml per litre, every 2–4 weeks. Add to the irrigation reservoir after the main nutrient solution. Use a coarse inline filter (500 micron minimum). Not suitable for precision drip emitters with apertures below 500 microns without filtration. Shake product well before adding.\"\n            },\n            {\n              \"@type\": \"HowToStep\",\n              \"name\": \"Spot treatment — individual plants with active deficiency\",\n              \"text\": \"5 ml per litre at 200–500 ml per plant, weekly for 2–3 weeks then assess. For a single plant showing blossom end rot or bitter pit, apply directly around the root zone at the higher volume to saturate it with immediately available calcium.\"\n            }\n          ]\n        }\n      ]\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Dr Forest","offers":[{"title":"1 litre","offer_id":55997612917110,"sku":null,"price":19.99,"currency_code":"GBP","in_stock":true},{"title":"500ml","offer_id":55997612949878,"sku":null,"price":12.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0049\/8194\/8504\/files\/organic-liquid-gypsum-fertiliser-white-plastic-bottle-ribbed-cap-326.png?v=1774782731","url":"https:\/\/www.drforest.co.uk\/products\/liquid-gypsum-micronised-calcium-sulphate","provider":"Dr Forest","version":"1.0","type":"link"}