Personally, I'm cool with RO as long as minerals are added back in later. Our household water is rainwater off the roof, so it has very little mineral content to begin with. We use RO in our drinking water system because to get rid of any mercury picked up in the atmosphere, the choice is basically RO or distillation. Following the RO is a calcite mineral cartridge and a Japanese Wellness Filter, which has all sorts of other minerals in it. You can also add a liquid mineral concentrate, like ConcenTrace.