zman-az wrote:
If you "really" want clean water RO is the only way to go.
Not necessarily. RO filters need to have the backside (incoming) side of them somehow dealt with to continuously get rid of, or kill, any virus and/or bacteria that may build up and live there on that incoming side of the filter.
We have lived off a spring/well combination in our stick house for 37 years by:
- Weekly chlorinating the main 5000 gallon tank down at the spring/well site to kill the living nasty stuff.
- Up at the house using a bank of parallel 0.5 micron solid core sediment filters to further remove any particulates that natural settling in the main tank doesn't remove.
- After that up at the house, as the final filtering step, using a carbon stack to eliminate the chlorine and any odors from the now safe and clear spring/well water.
We can't use RO at the house because a whole-house RO system would be too expensive and a kitchen-only RO system would be contaminated soon due to no chlorine in the water coming into it to kill any virus/bacteria that might reside on the incoming side of it.
RO filters have their place - but are not a be-all end-all way to treat water in every situation. As I understand it, evaporative distilling of water pretty much makes it pristine ... if you don't need or want any minerals left in it.