As a longtime swimmer and water polo player, my eyes have been absolutely wrecked by harsh pools many, many times. However, I don’t think it’s pee. First off, every swimmer pees in the pool. I have been a part of tens of thousands of man-hours in the pool and seen people get out to pee maybe three times. I have been in the first games of the day at water polo tournaments and have seen them chlorine shock the water fo…
A friend expressed this to me once when I caught her peeing in the pool and I was honestly skeptical that "everyone does it" as I would have never felt comfortable doing that. Still don't.