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What is liquid gypsum?

By Joe, Founder of Dr Forest · June 2026

What is liquid gypsum?

Liquid gypsum is natural gypsum, the mineral calcium sulphate, milled to a fine powder and suspended in water so it dissolves quickly once it reaches moist soil. Dr Forest Liquid Gypsum is milled to around 5 microns and carries 19.55% calcium and 15.31% sulphur, with fulvic acid added to help calcium move into roots.

It is a thick, creamy suspension rather than a clear solution, because it holds real mineral particles in the bottle. Those particles settle on standing, so you shake it before every use. The gypsum is quarried from natural rock, not recovered as an industrial by-product, and the only additive is fulvic acid. Like everything we make, it is plant-based, with no slaughterhouse by-products, and it is handcrafted in small batches in Stockport.

The point of milling it so fine and suspending it in water is speed and reach. Coarse granular gypsum can sit on the surface for months before it dissolves. At 5 microns the mineral goes into solution within hours of touching wet soil, and you can water it down to the root zone through an ordinary watering can. That is what lets you treat the soil under an established lawn or border without digging anything in. You buy it as a concentrate and dilute it to the rate for the job, which keeps the cost per litre of finished drench sensible.