Gypsum is a natural form of calcium sulfate, CaSO4. It is relatively insoluble in water and is the main constituent of permanent hardness in water. When in the crystalline or dry powder form, it is also known as “Alabaster” or “Plaster of Paris.”
Brewers know it as the main mineral in the well water of Burton Upon Trent, England, and is widely considered to be the essential component of the water for pale ale and India pale ale brewing. It is the main ingredient in “Burton Water Salts”.
Usage: 1/2 – 2 teaspoon in the mash or sparge water