This is probably a stupid question, but truly what are the advantages of using RO/DI h2o. I have been using tap h2o and conditioning it with either prime or AmQuel+ wich both remove nitrate, nitrite, ammonia, cholrine and chloramines. I think that my lfstores sell water there, but im just unsure of what the real advantages are, and also does a UV sterilizer do the same thing as a deionizer would, is that what they use in the stores?