Eli5 if chlorine is toxic how come it doesn’t harm me in swimming pools?

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Eli5 if chlorine is toxic how come it doesn’t harm me in swimming pools?

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Chlorine is present even in tap water you drink. It’s toxic in large amounts, but both tap water and pool water cointain only small amounts of it that are toxic to bacteria, but not humans.

It’s the dose that makes any substance a poison. Chlorine bleach is extremely effective even at low concentrations. You could add a tiny amount to disinfect drinking water, and drink it before it had decomposed and evaporated off.

It does harm you. Not in any dangerous way, but for example causing irritation and redness of your eyes.

Our skin protects us from the harm the chlorine would cause. Both chlorine and soap work by ripping open the cell membrane, killing bacteria and disabling viruses. Human skin is composed of many later of dead skin cells with tightly compacted proteins holding them together, forming a barrier against the outside. This si why you don’t dissolve you own hands when you wash them with soap!

If you start drinking pool water, it will certainly make you ill.

If you go to an indoor wave pool that’s highly chlorinated you may pick up a nasty cough.

Chlorine in pools is kept at a low enough concentration that it doesn’t harm your skin, but a higher concentration certainly would.