Great site! I did want to express some concern about the brass shutoff valve you have on your RO system. Doesn't brass contain copper? I'm worried that that valve might contaminate your water with copper...
Thanks for the comment. I don't think RO water is corrosive enough to cause copper leaching from brass. I'd never use brass in saltwater, but for RO, I'm not concerned. Most homes have copper piping so we'd all be screwed if there was significant leaching.