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Old 09-29-2011, 01:43 PM   #1
I'm no atheist scientist, but...
Oct 2009
Thiensville, Wisconsin
Posts: 8,389
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Would it be feasable to use potassium carbonate (K2CO3) to modify brewing water?

I think the recommended daily intake of K is somewhere between 4-5 grams a day.
The man who intoxicates himself on bad whisky is sometimes moved to kill his wife and set his house on fire, but the victim of applejack is capable of blowing up a whole town with dynamite and of reciting original poetry to every surviving inhabitant.

"A Wicked Beverage," New York Times, April 10, 1894

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Old 09-29-2011, 02:49 PM   #2
Aug 2010
McLean/Ogden, Virginia/Quebec
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No problems with it that I am aware of. It will be highly alkaline (as is sodium carbonate). Potassium bicarbonate could be used as well. Now neither sodium bicarbonate nor sodium carbonate should be used in the treatment of brewing water except in special cases and the same comments would apply to the potassium salts.

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Old 09-29-2011, 04:35 PM   #3
mabrungard's Avatar
Feb 2011
Carmel, IN
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Malt provides potassium and modifying the brewing water with K2CO3 could be an acceptable alternative for alkalinity addition. But the need to avoid excessive K or alkalinity in brewing water is a good goal as AJ mentions.

I would more strongly recommend going with pickling lime for alkalinity additions in brewing water. You avoid K and add Ca. It does require very careful dosing though.
Martin B
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