Calcium Carbonate

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Also know as chalk, Calcium Carbonate is used to increase the pH of brewing liquor which may become important if your water is soft and you are brewing with a high quantity of dark malts.  Due to it's limited solubility in water, it is highly recommended to add it directly to the mash. Stir well and monitor mash pH.

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.