Solubility: Gypsum is moderately soluble in h2o, that has a solubility of about two grams for each liter at 25°C. Apparently, gypsum reveals retrograde solubility, meaning its solubility decreases as drinking water temperature boosts – not like most salts that turn out to be additional soluble in very hot water. https://www.propanraya.com/id/produk/eco-gypsum-ee-4050