Hi Iconoclast --
It's been almost year since your post -- did you figure out how best to bring up the pH of RO water? I have the same problem -- my RO water is 5.7 and I'd like to bring it up to at least 6.5. ConcenTrace drops require such a large dose to make this jump that I don't digest food well when drinking it, so I am stumped about what to do next. I've been advised that RO water is "dead" water and that I should just drink bottled spring water. Not what I want to hear after the investment I've made in softening and cleaning my well water! I'm not a chemist so don't have a good answer to this one. Do you?