What's the worst thing about public swimming pools?

Okay, public pools are some of the most disgusting things I have ever encountered. People pee in pools all the time. ALL THE TIME. People also poop in pools. There is also the fact that generally public pools have a ton of people in them. Sometimes they are outdoors so you know those people are also sweating a bit. I don't know about you, but I would rather not take a bath with the sweat, urine, and feces (sometimes it takes a bit for the lifeguard or others around to realize that there is a turd in the pool) of strangers. That's just me though.