Here’s What Gives Pools That Chlorine-y Smell (Spoiler: It’s Gross)

That pre-swim shower? Not optional.

03/09/2016 4:36 AM AEST | Updated 03/09/2016 4:36 AM AEST
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The Question: Do I really have to shower before I go swimming?

The Answer: That sign in the locker room is not a mere suggestion. While very few of us would skip a post-swim shower (got to get that icky chlorine off!), we should probably follow the pre-swim rules with a little more vigor.

“If we don’t shower before we get in the water, we’re going to carry in whatever’s sitting on our skin,” says Michele Hlavsa, RN, MPH, an epidemiologist and the chief of Healthy Swimming and Waterborne Disease Prevention at the CDC. That includes natural oils, sweat, makeup and other personal care products, urine and, yep, fecal matter.

All of these materials have one thing in common, says Hlavsa: nitrogen. When nitrogen mixes with the chlorine in the pool, chemical irritants called chloraminesare formed, which is problematic for two reasons, she says. The first issue is that some of the very-important chlorine is now being tied up as chloramines rather than protecting us from the germs in the pool. Chlorine still manages to kill most of them, thankfully, but the survivors, when swallowed or inhaled while swimming, lead to some 10,000 illnesses a year among Americans, LiveScience reported.

The second cause for worry is the chloramines are what’s making that pool smell like, well, a pool. “A good healthy pool does not smell,” says Hlavsa, despite what most of us would like to believe. That smell we often attribute to a clean pool is actually the chloramines, which are also responsible for making your eyes red when you swim. The irritants are also thought to trigger asthma attacks and may even lead to some skin irritation, she says.

And all this time we’ve been blaming chlorine! It should be known the famed cleanser initially gained favor because of its ability to help prevent the spread of polio. According to Hlavsa, researchers continue to debate the risks of chloramines, though, especially as they may pertain to asthma, as well as other chemical reactions between chlorine and the gunk we add to the mix. “We’ve forgotten how important chlorine is in keeping us safe from germs in the water,” she says. “We have to keep in mind that it’s really important to shower before we go into the water so we leave more chlorine in the water to kill germs.”

While a full-blown lather, rinse and repeat is still the safest bet, a 2012 Dutch study found that even just a 60-second rinse goes a long way. Still, keep in mind next time you feel like slacking on your pre-swim shower that “everything that rinses off of our body we share with other swimmers,” says Hlavsa. “In some ways, it’s like getting into a big bathtub together.”

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