re: #52 Anymouse 🌹🏡😷

And there are places where entire towns use RO units because they are cheaper than water purification plants (like mine).

True, and in rural agricultural towns, RO may be the only thing that cleans enough Nitrate (from fertilizers) out of a public water supply to reach EPA requirements.

But you know this. It is the hell of Public Water System operators across rural America.