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Bowl of Gypsum used in beer making to add permanent hardness to brewing water and lower the pH of the water.

Calcium Sulfate (Gypsum)

by SoCal Brewing Supply
$2.59 - $4.99
$2.59
$2.59 - $4.99
$2.59

Calcium Sulfate (Gypsum) for Brewing Water Adjustment

Calcium sulfate, commonly called gypsum, is a brewing water salt used to add calcium and sulfate to mash or brewing liquor. Brewers use it when the water profile needs more sulfate-driven dryness, firmer hop bitterness, or additional calcium for the mash and fermentation process.

The Oxford Companion to Beer describes calcium sulfate as one of the primary salts used to improve calcium levels in beer. Its sulfate ion is generally associated with a drier, more bitter beer profile, which is why gypsum is common in pale ale, IPA, bitter, and other hop-forward water profiles.

What gypsum adds

  • Calcium: can help lower mash pH, support enzyme performance, and aid yeast flocculation when used in an appropriate range.
  • Sulfate: can sharpen perceived dryness and bitterness, especially in hop-forward beers.
  • Water profile control: useful for brewers building from RO or low-mineral water with a water calculator.

How to use gypsum

Use a water report and brewing water calculator to determine the right addition for the batch. Add gypsum to strike water, mash water, or brewing liquor according to your process. Avoid guessing by spoonful, because the right amount depends on your starting water, grist, pH target, and beer style.

For related minerals and additives, browse acids, salts, and water treatment or brewing ingredients.