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API Pond Algaefix Algae Control Solution, 32-oz bottle; API Pond Algaefix is a powerful water treatment that helps keep algae growth under control for your underwater sidekicks. It's specially designed for areas where the water is contained without any outflow like synthetically lined ponds, water gardens and fountains. This fast-acting algicide is effective for many types of algae including green or green water algae, string or hair algae and blanketweed in ornamental ponds. So, help keep your water clean and clear for your favorite finned friends with API's solutions.