Yep, every public pool, every outdoor pool, and every pool that ever has small kids in it has pee in it. Which is basically every pool. Also it's that a third of adults have admitted to peeing in the pool, so that number is likely much larger. That super strong "chlorine" smell that people associate with pools isn't chlorine, it's chloramine, which is, as my boss put it, "Chlorine bonded to "stuff"". "Stuff" being literally anything that isn't water. This includes pee, but also lotion, make-up, hair gel, everything. If you get bright red eyes from the water you don't wanna be swimming in it. A little red is expected, everyone having bloodshot eyes? Nope nope nope, you will not catch me in that water.