The practical problem with having two qualities of water in a home is that the contractors who are working on water installations are not careful enough. Obviou

The practical problem with having two qualities of water in a home is that the contractors who are working on water installations are not careful enough. Obviously you want to have zero risk that drinking water gets contaminated with less clean water. So in some projects where they started out with such a dual water quality setup, they have revered to only drinking water.