A neighbor is selling RO systems. He offered to measure my mineral content. I currently have a RaynePure under sink system that purifies Rayne conditioned well water. The RO water measured 240PPM. The water straight out of the conditioner is 1200. The water straight out of the well is 900. His system is a 7 stage that brings it down to 20. I don't know if 200 is good or bad. It's my understanding that some content is good. His system is Simple H2O out of Onterio, Canada. Any advice?