What is clay breaker made of?
What is clay breaker made of?
By Joe, Founder of Dr Forest · June 2026
What is clay breaker made of?
Most liquid clay breakers are gypsum, the mineral calcium sulphate, suspended or dissolved in water. Dr Forest Liquid Gypsum is naturally mined calcium sulphate milled to about 5 microns and suspended in water with fulvic acid as the only additive. There are no synthetic dispersants and no industrial by-product gypsum.
Calcium sulphate is the active part. It is the same mineral whether it arrives as garden gypsum, a soil-conditioner powder or a liquid suspension, so the label ‘clay breaker’ really describes what people hope it does rather than a different ingredient. The fulvic acid we add is a naturally occurring humic substance that holds onto calcium and helps keep it moving in the soil solution and into roots. That is the whole recipe: mineral gypsum, water, fulvic acid.
It helps to know what you are buying, because liquid gypsum is sold in two quite different forms. One is mineral gypsum milled and suspended in water, which is what we make. The other is a manufactured chemical solution. We stick to naturally mined mineral gypsum because it suits organic gardens and keeps the ingredient list honest. We never list the suppliers behind any input, but we will always tell you what is in the bottle.
From the Dr Forest range
Liquid Gypsum: micronised calcium and sulphur
19.55% calcium and 15.31% sulphur, milled to 5 microns and handcrafted in Stockport. A calcium and sulphur feed that does not change soil pH.
See rates and sizes★★★★★ 5-star across all platforms · 3,250 reviews · See the Liquid Gypsum page.