Beersmith program has me sparging with 3 gallons for a 4 lb. partial mash, 5q mash-in, no mash-out.
I just read in a book tonight, that you should not sparge with more than 2q/lb grain to avoid getting any tannins. That would be 2 gallons of sparge.
Also, the book says that over milling the grains can cause tannins, is that correct?