You'd better be careful about how much time you spend in public swimming pools. Studies at the University of Alberta revealed that approximately 75 litres of urine were found in Olympic-sized swimming pools. Yuck!

Believe it or not, that's not the worst part. Studies reveal that a swimmer ingests about 20 nanolitres of pee each time they accidentally swallow water. While that's not a lot, the chemical bonding process of pool chlorine and uric acid in urine can become hazardous.

The two chemicals together create cyanogen chloride, a toxic mixture that must be reported to the Organization for the Prohibition of Chemical Weapons if made in large doses. Slight exposure to the chemical might cause eye redness, nausea, and vomiting.

Before you swear off public swimming pools forever, remember that a small amount of this substance isn't harmful. "In that one suspect mouthful you'd actually be drinking less than two and a half picograms of the stuff "“ one thousand million times smaller than the safe limit," says MSN.com.

Did you know this? Make sure you share with your friends.