Calcium Sulphate

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Also known as gypsum, it is typically used to add calcium to the brewing liquor if your water is low in sulphate.  Can also add hardness, lower the pH and add a "crispness" to the hop bitterness in hoppy beverages.

Make sure you know your water profile and use one of many water adjustment spreadsheets/calculators available online before adding brewing salts to your water.