By Dr. Bob McCauley
Question from Dr. Bob:
English is not my first language, but . . . Calcium and magnesium hydroxide are insoluble in water. But we don’t see any white residue in commercial alkaline ionized water bottle. These particles (as an alkaline agents) are probably filtered, my question is ” if calcium and magnesium hydroxide are filtered, why this water have pH 9 or high??” thank you I’d be happy and it is my pleasure if you tell me this. – Maryam
Thanks for your email and I’m happy to know about your interest in alkaline ionized water. Perhaps some mag/cal will be filtered but not all of it. Most is dissolved, meaning it cannot be filtered. Even with the high pH there is not enough time to filter those minerals before they precipitate out in the high pH environment of the water. So the white film that accumulates inside a glass over time is the precipitate, but as you can see it was too small to be filtered. I hope this answers your question.