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This non-copper-based algaecide eliminates algae on contact. Designed for lakes, ponds and unpainted surfaces. Sodium carbonate peroxyhydrate destroys algal cell membranes and chlorophyll within 60 sec. Biodegrades completely and adds 13% bioavailable oxygen to the water. For spot treatments apply at a rate of 20–50 lbs/acre-foot; for algae blooms apply at a rate of 9–30 lbs/acre-foot; for filamentous algae blooms treat at a rate of 50–90 lbs/ acre-foot. Safe for use with koi and trout. EPA-approved.