Originally Posted by ajdelange
The amount required depends on the original pH and alkalinity of the water and the pH you want to shift it to. Bru'n water has a calculator.
I am aware of this but could have worded my question better. Assume that my tap water pH is 8.1, I'm aiming for a sparge pH of 5.7 and I want to sparge with 6 gallons. Bru'n Water will calculate for the sake of argument 3 ml of lactic acid for me. Can I assume I can always add .5 ml of lactic acid per gallon of sparge water regardless of the grain bill, batch size etc. since 3 ml / 6 gallons = .5 ml lactic acid per gallon of sparge water?