Is It Safe to Put Bleach in Pool Water?

Chlorine is used in swimming pools because it kills bacteria and algae, among other organisms, making the water safe for swimming. A gallon of 5.25 percent chlorine bleach added to 60,000 gallons of water produces a chlorine concentration of one part per million. The ideal level of chlorine residual for a swimming pool ranges between one and three parts per million. Chlorine levels in swimming pools are measured using water testing kits.