There's a Whole Lot of Pee in Every Pool

Plenty of people have peed while swimming, but what might astonish you is just how much mellow yellow is in your average public pool. According to a new  University of Alberta study, the average large pool contains almost 20  gallons of urine at any one time. 

While the health benefits of swimming  vastly outweigh the risks posed by traces of hit whiz in the deep end,  Purdue University engineer Ernest Bletchley tells NPR, "I think you can  assume that if people are using your pool, they're peeing in it. I view  it like secondhand smoke: It's disrespectful and potentially dangerous."

Source:  NPR