I agree: in fact the deionization process adds one hydronium or hydroxide for every (mineral) ion it removes: >Deionization is a chemical process that uses spe

I agree: in fact the deionization process adds one hydronium or hydroxide for every (mineral) ion it removes: >Deionization is a chemical process that uses specially manufactured ion-exchange resins, which exchange hydrogen and hydroxide ions for dissolved minerals https://en.wikipedia.org/wiki/Purified_water#Deionization https://en.wikipedia.org/wiki/Purified_water#Deionization In other words, if deionized water is unhealthful because of a lack of ions, distilled water is, too, because it doesn't contain any more ions than deionized water does.