Dear PF Forum, Recently I'm studying an ionizer water machine. This machine claims (it's what it says) that it can turn 'ordinary' water into alkaline water and good for health. It's not the machine that I ask, but it's the alkaline property that I want to know. Why is the walter alkalinized? Is it OH-? I read that alkalinized water is good for health And I also read that Hydroxide is a radical, and radical is not good for our health. Perhaps someone can explain to me, where does the alkaline property come from? Is OH- is really bad for our health. Or is OH neutral is the radical agent while OH- is actually good. Thanks for any explanations.