Sure, probably, maybe, possibly ......... or not, and it does. Real life hands on experience for a few decades speaking here squint. How about you? I have seen filter bacteria killed, tanks crash, and fish deader than a door nail from exposure to chlorine, and chloramine. I have seen some of what appeared to be exactly that, right here on MFK over the years. Toxic? Naaah, never.
But hey, keep fighting the good fight.
But hey, keep fighting the good fight.