I've worked at pools. its about a half dozen times a summer at a fairly busy pool. pool gets shocked (extra chlorine) and then I forget how many hours and its good to go. oh and any chunks are netted out first. the lifeguards get a nice break.
eh. I was the poor lifeguard sometimes. not much worse than picking up your dogs poop. its not like you have to do it with your mouth, there are gloves and bags.