Water that initially has mineral concentrations called Total Dissolved Solids (TDS) too high to sustain long-term CP health, can be treated in many different ways to reduce this TDS. Reverse Osmosis, De-ionization, and Distillation are just a few of them. Water with 10ppm of TDS or less, is considered distilled water quality. I once lived in a location where the tap water, sourced from a local river had TDS equal to distilled water quality (the good old days). Ozone, when dissolved in water becomes H2O2 (Hydrogen peroxide), it is very unstable and quickly breaks down again, into water and oxygen. Rain water naturally contains some dissolved ozone as well as other gasses.