Adding gypsum to the mash tun?

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Brewedout

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I'm about to make a Russian imperial stout, with a larger amount of chocolate, amber and black malt if pH is too acidic in the mash tun can I add gypsum to the mash? Or am I worrying over nothing?
 
mash pH depends a lot on the water you are using, so if you do not have a water analysis report (or you're not using bottled water with detailed info on the label) then it's impossible to say what will happen to the pH and whether or not to use additives and if so, in what amounts. Trial and error seems to be the way with these things and if it works for you, keep doing it. It is of course good to make an educated guess at first.
 

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