Chloramines -- incompletely oxidized goo -- stinks with an acrid chlorin-y smell, when you aerate.

If you are experiencing this, you probably need to look for the source -- not chlorine, the goo! Again, this is often NOT something added deliberately, but rather something like lotion, urine, sweat, cheap algaecides, pool additives, etc. It could be something 'natural' like tree sap (aka aphid pee*) if you have a tree overhanging the pool.

Ben

* Specially for you, Watermom. Aphips pee sugar water, after they remove the nutrients they need from tree sap. It's this aphid pee that ants drink -- ants 'farm' or 'herd' aphids, and that makes the stickly little droplets that get on your car when you park under a tree.