Thanks Martin, erockrph, Brewark, great information. I am a Metallurgist, comfortable handling acids, but prefer not to deal with concentrated acids.
I see several 1/2 or 1 liter versions in Cynmar's listing, but they don't mention grade. Some are 18M, which is 98%, no thanks. There are "10% solution" and "10% V/V", which make no sense to me. I thought liguids were normally measured in volume %, but what's "solution?" Again, there's no mention of grade.
For now, I'm going to try and balance my water chemistry with Phosphoric acid and salts. Does everything have to be hard? Thanks, guys.