Click to expand Tap to zoom Calcium sulphate, 100 grams by BrewGoat® Sale €1,95 50 g - €1,95 100 g - €3,95 Size 50 g 100 g 291 in stock. 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Calcium also called gypsum/gypsum which is used to gooden the hardness of your water when brewing beer at home.