This is silly. For one, pee and sweat are the same thing. So you don’t have to pee in a pool. Your sweat is always washed off. If you are laying in the hot sun and jump in the pool your urine is in the water. But besides that. A pool also sits in the sun and it evaporates all the time. New water is added so the pee is diluted over time. Also the chlorine does rid the pee of live organisms. So there really isn’t much about the pee that is unhealthy.
We have had pools for over a century and there is little evidence of health issues over that time.
FYI unless you have a bladder infection urine is sterile.
Pee and sweat are not the same thing.
http://www.differencebetween.net/miscellaneous/difference-between-urea-and-uric-acid/