Just how much pee is in your average public pool? Canadian scientists think they have found a way to estimate the amounts of urine mixed in with all the other chemicals and human byproduct by testing samples from pools and hot tubs for the presence of the artificial sweetener, aspartame potassium. The stuff doesn’t break down and remains stable in pool water.
In one study, researchers took samples from a 220,000 gallon pool and a 110,000 pool over a three-week period. They estimate that the larger pool had 75 liters (almost 20 gallons) of pee, and the smaller pool had 30 liters (almost 8 gallons).