Stop algae growth in its tracks! TotalPond Algaecide restores the health of your pond or water feature by preventing green water, eliminating existing algae, and resolving additional algae blooms. It effectively controls many types of green or green water algae, string or hair algae, and blanketweed in ponds that contain live plants. One 16 oz. bottle treats up to 4,730 gallons of water. Add 1 tsp (5mL) for every 50 gallons of pond or fountain water. Once algae growth is under control, add one dose every 5 days. Weekly doses of Algaecide will control growth and reduce pond or fountain maintenance. During warm summer months, adequate aeration is required. So, pumps and aeration devices should be kept on at night when using this product. For ornamental water feature use only, where all water is contained without any outflow. TotalPond Algaecide is EPA-registered and can be used in ponds with fish and plants.