On the south gate of The Workers Stadium.
2 big pools. one for laps the other for play.
cheap. 10kuai...
fun to sit around on a nice day and watch the russians walking round in their G-Strings and the steroid munching, hulk like chinese bodybuilders in their tiny tighty speedos, next to the cocophany of heavily overweight Chinese children, and the un-fit, old ayis they have sitting in lifesavers chairs.

damn good for an amusing afternoon. you need to "qualify to swim in the lap pool, if you are fat, pregnant, old or young they will force you to proove yourself by swimming 4 laps, before granting you access.....
goodluck..