Obviously nobody should pee in the pool, it's just gross and rude. But there is a valid scientific reason not to relieve yourself that in the concrete pond.
The CDC recently shared a social media post warning against the common practice. “Pee in the toilet, not in the pool!” the message says. “When pee and chlorine mix in the pool, there is less chlorine available to kill germs.”
The CDC also warns that “pee mixed with chlorine creates chemicals that can make your eyes red and itchy.”
If you think someone has peed in your pool, here's how to find out how much is in there.