I am preparing to brew a red ale next weekend and i am having some difficulty with my water calculations. I typically use RO water and add minerals. My RO water has an estimated RA of 0. Mg .34, Na 1.1, Ca 1.9, SO4 1.2, Cl 1.3.
Srm of the beer is to be 16.4. For this beer i would like a target RA around 10-15.
I am trying to raise my calcium and mag levels to appropriate mash levels but when i do i throws my estimated RA into the 30 range. Also my calculted mash pH is outside of where it should be.
Should i just add chalk to get my calcium to 50 and not worry about the rest?
Will I get enough mag from the grains in the mash or do i need to add epsom?