I am just learning the bru'n water spreadsheet. I will be using 100% RO with the bru'n water recommended mineral additions. I usually heat 7 1/2 gallons of strike water even though I only need 4.66 gallons for this recipe. For the mash water volume, do I enter 7 1/2 gallons or 4.66?
I also heat 7 1/2 gallons for my fly sparge water even though I use a lot less. What amount should I enter for the sparge water volume?