West Coast Brewer Home Brewing Blog

Calcium Carbonate or CaCO3

Calcium carbonate or CaCO3 is precipitated chalk. It is typically used in brewing as a water adjustment to increases the pH of a mash. You will want to verify with your vendor, but 1 gram per gallon usually adds 106 ppm calcium and 158 ppm carbonate.


Calcium Carbonate \ Chalk

Calcium Carbonate \ Chalk


  1. Paula

    Is the CaCO3 filtered out afterwards or does it remain in the beer?

    • Joe

      Thanks for the great question Paula. No, the calcium carbonate is not filtered out, it dissolves into the water impacting the pH of the water, wort and finished beer.

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