Calcium Sulfate (Gypsum)

Calcium Sulfate, commonly known as gypsum, is a water chemistry additive used in home brewing to increase water hardness and accentuate hop bitterness and aroma — making it ideal for pale ales, IPAs, and other hop-forward styles. It also helps lower mash pH for better enzyme activity, improves yeast flocculation for a clearer finished beer, and enhances protein coagulation during the boil.