omg peepee is the least of whats gross thats been in that pool, at least urine is sterile...(not that it makes it any less yuckie though lol)....
With the amount of chlorine I wouldn't worry about pee, lol. Having recently been at another un-named adult resort...they had to skim "sticky and gooey" floating stuff from the pool (while we were in the pool btw). Now that was kinda gross...but alcohol helped, lol.
I am not sure why the scum that floats around the edge does not go into the skimmers. Our pool is obviously not nearly that large and does not have as many people in it every day, but bugs and stuff go straight to the skimmers and are gone forever.
Dont say no one goes to the bathroom.... I would never piss in a pool and I see people all day hop out of the pool and use the bathroom all day long. I am sure people do pee in the pool but that doesnt mean we all do. Since you said no one used the bathroom I guess that includes yourself right?