外文标题：Eyes go red and stingy after swimming because of urine, not chlorine
The red, bloodshot eyes that people get after being in a swimming pool aren't caused by chlorine, as thought but by what happens when people urinate in the water.
People weeing in the pool means the urine reacts with chlorine to create a chemical compound that hurts the eyes, according to the US's Healthy Swimming Program. And those chemicals can also create poisonous gases that can damage lungs, hearts and nervous systems.
"That 'chlorine' smell at the pool isn't actually chlorine," said Chris Wiant, chair of the US Water Quality and Health Council. "What you smell are chemicals that form when chlorine mixes with pee, sweat and dirt from swimmers' bodies."
Experts have pointed out that despite the story told to children that a dye in the water will show if they've urinated in the pool — as almost half of Americans believe — it's actually very difficult to tell when it has happened. In fact, having red eyes are the biggest indicator, according to the National Swimming Pool Foundation.
Weeing into chlorinated swimming pools actually depletes the effect of the chlorine, meaning that more might need to be poured in. And even if it is, chlorine doesn't get rid of the most common illnesses — many bacteria can continue to live on for days in the pool, once they're in.
Experts say that bathers and swimmers must be extra careful to ensure that they're properly washed before they get in, and relieve themselves elsewhere.
"The solution isn't rocket science; it's common courtesy," said Michele Hlavsa, chief of the US Center for Disease Control's Healthy Swimming Program. "Swimmers should use the pool to swim, the restroom to pee and the showers to wash up before getting in the pool. It's that simple.
Ali Shah (Pakistan)
Some types of allergies also make your eyes red after taking bath even in shower.
But how are you going to stop the mischief mongers from urinating in the swimming pools ?
joykutty cherian (Location)
Even if two or three people urinate in the water, how it will contaminate thousands of gallons of water..? Poor reporting.
Gurmail Bhamra (england)
everyone,s body is different,their body odour is different.when lots of people swim together water properties change.there should be a notice on every swimming pool not to urinate.
I don't know about foreigners but surely Indians are urinating in swimming pool.
Rahul Chauhan (Unknown)
This is really important thing to discover......and disgusting also how can anyone pee in swimming pool
Pajavara Purshotham (Hyderabad, Andhra Pradesh) 16 hrs ago
In US some of the pools use saline water and they test the quality of water every day. If required they add specially formulated salt to balance the salt content in the pool.