Re: Ionized water or Reverse Osmosis?

 RO water is mildly acidic because all the minerals are forcibly removed from the water by the filtering process.

Both R/O and distilled water become acidic quickly, but it is from the gases they absorb from the air. Pure water is very solvent. And the more pure it is the more solvent it becomes. In fact ultrapure water is actually corrosive. The purified water looks for something to saturate with, so it absorbs gases, primarily carbon dioxide, from the air forming acids. In the case of carbon dioxide carbonic acid is formed. Another great example is acid rain. When rain water falls, which is naturally distilled water, it reacts with carbon dioxide, nitrogen oxides, and sulfur oxides forming carbonic acid, nitrogenous acids, and sulfurous acids. Most of this is supplied by pollution, so areas of higher pollution have more of a problem with acid rain.