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Here's a fun one
You know how you go to the public pool and you smell the chlorine keeping the water clean? That's not chlorine you're smelling.
Chlorine is a great sanitizer but when dissolved in water it has almost no smell. However, chlorine binds to organic substances like dead skin cells and especially strongly to urea (aka pee), forming chloramine. Chloramine has significantly less sanitizing capability than chlorine, but it has a very strong chloriney smell.
You can get rid of chloramine by 'shocking' the pool- adding an oxidizer or increasing the chlorine level very high to what's called breakpoint chlorination. Shock powder is expensive though so it's not always used as often as it should be.
So when you go to the public pool and you get that strong chlorine smell, all that means is either the pool water is dirty and hasn't been shocked in a while, or someone peed in the pool recently.
Enjoy your swim!
My wife was so mad at me when I explained this to her. She said the chlorine smell would give her nostalgia and I ruined it.