![Gypsum (Calcium Sulphate), 8 oz](http://shop.artisanswineandhomebrew.com/cdn/shop/products/5355_grande_7cde44f9-9164-4d1a-9e0e-6739fe1495df_{width}x.jpg?v=1518127013)
Gypsum (Calcium Sulphate), 8 oz
Gypsum (also known as Calcium Sulfate) is used to add permanent hardness (Calcium ions) to brewing water. 1 gram in 1 gallon changes the salt levels by 61.5 ppm calcium, 147.5 ppm sulfate and adds 153.5 ppm to the hardness.