Gypsum Powder Food Grade Calcium Sulphate Fertilizer Tofu Coagulant Brewing 1 lb Product Description It increases calcium and sulfite levels in Soft water, increases acidity, and helps to settle proteins during the boil. Great for baking, brewing, wine making, pickling, and tofu making. Can be added to water to increase hardness. Use in the garden to increase calcium and sulfur levels in soil, increase soil’s water retention, to treat blossom end rot, or to make mushroom spawn. Use in building to make plasters, molds, and casts. FeaturesGreat for baking, brewing, wine making, pickling, & tofu making.Treat soil & garden plants.When using distilled water for Brewing, gypsum adds hardness to the water.