Just FYI, you can also buy RODI water at most grocery stores(safeway, fred meyers). Those giant machines with a penguin on them, that dispense it by the gallon for roughly 30-50 cents per gal. I just drag in a few 5gal camping water jugs and fill em up. I'm not sure about the other companies, but the ones with the big black penguin on the front(can't for the life of me remember the brand name, maybe Glacier?) states that it is RODI, as well as carbon filtered, ozonated and micro filtered. Or maybe its all the same thing as Reverse-Osmosis and deionization? lol