Clorox Pool & Spa Xtrablue Algaecide 40 oz Catalyst apply anytime as a preventative

apply anytime as a preventative treatment or after you see evidence of insect activity

Cuts abrasive construction materials

Cured sealant is mildew resistant

drain opening fits PVC or ABS Sch

True Blue I-Beam level offers superior performance in all key areas of user needs and functionality

Clorox Pool & Spa Xtrablue Algaecide 40 oz Catalyst apply anytime as a preventativeKeep your swimming pool clean with Clorox Pool and Spa Xtra Blue. It prevents the growth of green, mustard and black algae. It also kills bacteria and works without changing your pool's pH level. This pool algae killer uses a patented non foaming formula, which keeps it from staining surfaces and makes it safe and suitable for most types of pools. Results in just 24 hours. Salt pool compatible.