Description
Calcium carbonate (chalk) 25 kg – raises mash pH
Calcium carbonate, CaCO3, also known as chalk, is mainly used to raise the pH of the mash. This is especially relevant for dark beers, where dark malt pulls the pH down a lot. The chalk is food grade and comes in a 25 kg sack from Murphy & Son.
Please note: This product is only available in Norway.
How to use chalk
- added to the mash, mixed in with the malt
- needs an acidic environment to work, so it does not belong in the sparge water
- adds calcium, which the yeast needs
Technical data
- chemical formula: CaCO3
- packaging: 25 kg sack
- food grade
- manufacturer: Murphy & Son
Data sheets
Frequently asked questions about calcium carbonate
When is calcium carbonate used?
When the mash pH gets too low, typically in dark beers such as stout and porter. The ideal mash pH is 5.2–5.6.
Can I add chalk to the sparge water?
No. Calcium carbonate needs an acidic environment and belongs in the mash, not in the sparge water.
What is the difference between chalk and gypsum?
Chalk (calcium carbonate) raises pH. Gypsum (calcium sulphate) lowers pH and adds sulphate, which accentuates hops and bitterness.
How much should I use?
It depends on your water and the beer you are brewing. Brewing software such as Brewfather calculates the salts from your water profile and target profile.
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