Do Olympic Swimmers Pee In The Pool? 'Nearly 100 Percent' Do, Says Former U.S. National Team Member

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10. Newer pools use a saltwater filtration system.

But, there's a good chance they bleach the deck. Now we know why. I always thought it was to keep the mildew down.

That being said, there are roughly 660,000 gallons in an Olympic-size pool. Even if they pee out a Big Gulp, it's still a drop in the bucket, even without the water being constantly filtered. And, out of that, 95% of that is water. Nonetheless, if everyone pees in the pool, it can cause a disaster of epic proportions: http://www.southparkstudios.com/full-episodes/s13e14-pee