I use to be a lifeguard back in high school I love saving people and securing safety in pools.
Really? Why do people have to rinse off before getting in the pool?
It is to get them already wet and suppose to be a protection for no harm to users once in with the chlorine. 
So it works as a shield? Did you ever save someone's life?
Yes basically and no my time working everyone followed the rules but we was always training to ensure we know what to do in a incident of drowning.