Join Date: Apr 2006
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The UV-C systems are not purifiers, they are sterilizers.
These are two different issues. "Pure" r/o water will have organics and chemicals and metals and silt removed from it, and it may even be close to sterile as it is produced. But any water system can have critters growing in it and drug-resistant (and chlorine resistant) critters have been making the news in the last ten years.
A UV-C system is a good way to ensure there's nothing growing in your drinking water, which could easily be contaminated, say by e-coli that washed in from a loose deck fill cap after a bird poo'd on the deck.
Even in dental offices, they've had problems with critters growing in the water lines and many no longer fill your rinse cup from the "chair" tap, but use a larger faucet or bottled rinse because they got so much flack over it.
Probably a bit over-conservative...but wtf, it is cheaper than curing one round of intestinal problems.