We drink filtered water (just a plain ole carbon kind), but have not done much research into it. We originally put a whole-house filter (again, sand/carbon type) on when we moved into this new house. The water here is VERY soft naturally, but they chlorinate it, sometimes heavily. (Luckily, though, they do not flouridate). We loved this filter UNTIL, we started noticing the green/blue build up in the tub and shower floor. Started looking into that. Apparently, the purer the water, the harder it can be on pipes (some say this is a myth, but when we turned that filter off, the copper build up stopped.) I really think excess copper is playing a role in my health as well, because my symptoms escalated when we moved into this house, and come to think of it, they improved some when we turned that blasted filter off.

See, I feel danged if I do, danged if I don't here. Copper pipes -- well, copper and sometimes, lead. PVC -- BPA, and possibly plasticizing metals, the pond -- parasites, etc. There seems to be very few perfect water sources.