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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > How much Calcium Carbonate
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Old 08-21-2011, 03:58 PM   #1
cpz28
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Default How much Calcium Carbonate

If I'm using RO water and brewing a dark beer (porter), I'm not sure if I should add only enough calcium carbonate to in the mash to treat the mash (4 gallons) or since calcium carbonate only dissolves in the mash, if I need to add enough to the mash to treat the whole 8 gallon preboil. I fear adding too much to the mash will have negative effects on my mash/ph. Help?


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Old 08-21-2011, 04:19 PM   #2
shanecb
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Well I put this in your other double post, but I'll put it here, too.

Just add to the mash to treat the mash. You can just add the remainder to the kettle to treat the rest of the water, or your sparge water.


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Old 08-21-2011, 05:55 PM   #3
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Read the water chemistry primer. http://www.homebrewtalk.com/f128/bre...primer-198460/
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Old 08-21-2011, 08:15 PM   #4
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Quote:
Originally Posted by cpz28 View Post
I fear adding too much to the mash will have negative effects on my mash/ph. Help?
Adding any, in fact, may raise the pH past where you want it. Mash pH seldom comes in too low.

Your base malt in RO will probably land around 5.9. Adding in the dark grains might pull it down to 5.6 or so. CaCl2 and gypsum will likely pull it the rest of the way down into the happy range. Try it.
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