I was at the pool the other day and got to thinking how odd it was that there is a lot of people in the water...yet none of them had to go pee........hmmmmm.......... then all of a sudden a little boy started puking IN the pool. we all got evacuated out and the scooped as much as they could out and poured chemicals over it. after awhile they let everyone BACK IN. I thought to myself eww how contaminated is this pool? I have also been there when someone went number two in the pool. So i am also wondering how often do these types of things happen...and how often do you think they change the water?