..... just to add to that: someone has now invented a reverse osmosis water cart - kid(s) pushes the water cart to go get water from a well ... where ever the well is, and as they push the water cart back home, a pump mechanism connected to the cart wheels drives/pumps the water in the tank on the cart through a small reverse osmosis unit.

Result: prevsiously un-useable contaimanted shallow well water is now safe for consumption.