This slow-dissolving 1/2-ounce tablets provide powerful chlorine sanitation. It has 89-percent available stabilized chlorine. Ideal for use in floaters, feeders and skimmers. Epa registered. Small 1-inch tablets are part of our no algae guaranteed program which guarantees that your pool will be algae-free all season long if you use a glb sanitizer, algimycin 2000 algaecide and oxy-brite non-chlorine shock oxidizer. Compatible with chlorine. Product contain 2-pounds