I have seen more plant problems caused by water impurities than almost anything else.What are you basing this on ? You have no idea of his water quality
The post was about what you said in the about post. Hydroxyl is highly reactive and mobile. It does not accumulate.I know what a pH ist and you won't impress me with some dumb copypasta. Quote a textbook but not this lie machine.
Alkalinity in tap water is mediated by bicarbonate. There are only negligible amounts of hydroxide.