Solubility: Gypsum Is moderately soluble in h2o, with a solubility of about 2 grams for each liter at 25°C. Interestingly, gypsum reveals retrograde solubility, this means its solubility decreases as drinking water temperature raises – unlike most salts that become far more soluble in very hot h2o. Agriculture: Soil Conditioner: https://www.propanraya.com/id/produk/eco-gypsum-ee-4050