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Great for spot-treating Cutrine-Plus® Granular Algaecide controls bottom-growing algae. Clean, dry, granular algaecide sinks rapidly and works evenly over the affected area. Easily spread from the bag (wear gloves) or with a crank-type rotary spreader. EPA-approved for use in lakes and potable water reservoirs, farm fish ponds and fish hatcheries. For spot treatment, apply at the rate of 1 lb per 720 ft2 (1 kg per 147 m2). 30-lb bag. Made in USA.