One of the natural food stores in my area sells bulk water (fill your own bottle) that has been carbon filtered, undergone reverse osmosis, filtered another way, and then UV sterilized. It sounds like there is actually a UV light in the unit that goes on as the water is running out...?? Does anyone know if the UV light would be good, bad, or neutral? My other option is regular reverse osmosis bulk water from Whole Foods, but that water is more expensive (although not by much). I can't use my Berkey because of my living situation right now and I'm sick of spending money on bottled water.