Something you probably didn't know, and if you are a regular swimmer, may not wish to know. That smell isn't chlorine, at least not the element. It is actually a chlorine compound called chloramine, which is created when chlorine combines with organic substances in the water.
So what are those organic substances? We are talking about sweat and urine.
So if you've ever noticed that the "chlorine" smell is stronger when the pool is full of kids, well now you know why.
(Lifted from BBC News Magazine). Gerry.
