Seattle firefighters evacuated the Southwest Community Center at 2801 S.W. Thistle on May 7 due to a pool chemical spill consisting of 150 to 300 gallons of 13 percent sodium hypochlorite.

There were no injuries.

The call for fire aid went out at 4:53 p.m. and a lifeguard on duty at the time said a "small check valve" failed, causing the spill.

Sodium hypochlorite is similar to household bleach.