>Probably not as unknown, but the smell in pools that I've always associated with chlorine is in fact the smell of some product when chlorine react with urine.

Chlorine does have a smell, and fresh pools do smell (where nobody has entered, much less, urinated in them yet).

From the linked article itself: "A healthy chlorinated pool can emit a light chemical odor, especially if it is an indoor pool and one with less than ideal ventilation".

The most common smell once people enter a pool is from chloramines from other kind of pollutants (body oils, etc) not urine. If it gets to urination you get much stronger smells.

But the smell you've associated with chlorine is 99% chlorine derivatives, present in any chlorinated pool, i.e. the "chemical odor" mentioned in the article.