Sorry got it the wrong way round. Thus compounding the error. Was horrified when given a 3rd year GCSE Chemistry class to teach for a year. I was one page of the text book ahead of the little so and sos. Eventually grasped basics when DS2 was doing his GCSE. We got a B!!! Big improvement on the original O level, attempted 3 times before a pass was achieved.
Someone, elegran, mentioned oxygen hydroxide. does not make sense. Then neither did I.
Anyway the Chinese medicines being often contaminated thing is the important point here, not the chemistry of water.