Lifeguards told firefighters they had some problems Tuesday night with the chlorine - which is a little bit stronger than what is sold in stores.
As of 6 a.m., the complex had been evacuated, but no one in nearby housing was told to leave.
Crews were able to stop the leak about 30 minutes later. Employees at the center say they will reopen around 9 a.m.
According to Pullen Aquatic Center's website, the center was completed in 1992. The aquatic center features an indoor Olympic size swimming pool, warm water therapy pool, outdoor patio and locker room facilities.