BOISE, Idaho (KBOI) - Have your eyes ever started to sting or turn red while you were in a swimming pool? Well, that's not just the chlorine. It's caused from chlorine mixing with urine or sweat -- and it can make you pretty sick.
That's why every year thousands of Americans get sick after jumping into a pool.
The Centers for Disease Control (CDC) found more than half of every pool water, 58 percent, contains E. Coli.
So what can you do?
-Make sure to shower off before getting in the pool
-Avoid swallowing the water
-Make sure to take a bathroom break about every hour.
Here's who's most likely to catch a water illness:
-Anyone with a weakened immune system
But something else to keep in mind, the CDC says, everyone is at risk of getting sick as soon as they get into the pool.