I think it depends on the alkalinity more than the pH. If your sparge water is soft, the grain should have no problem buffering it, but I can't really think of a down side to adjusting besides the PITA factor.
When I brew a dark beer, the mash liquor needs nothing, but I add CaCl2 and gypsum to the sparge to keep the pH down.
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OD: SMaSH Gambrinus Organic Pils/Spalt Select (2308), SMaSH CMC Pils/Spalt Select (2308)
Pri -
Keg: SMaSH Mystery Malt/Spalt Select (2308), SMaSH Munich/Northern Brewer (2308), SMaSH Briess Pils/Spalt Select (2308), Kronik (WL002)
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