Swimming is one of America's favorite pastimes when the temperature goes up in the summer. With millions of people cooling off in the water each summer, keeping the water clean and safe is a full time job. 85% of all swimming pools in the US use chlorine to sanitize the water and keep things safe the swimmers. It's a good thing too- 17% of people admit they've urinated in a pool! Guess how many people jump into a pool without showering first?
