Tetra AlgoFin Pond Treatment 500ml In order for customers to enjoy their ponds and keep them healthy, it is important that they avoid some of the common problems associated with them. Tetra's pond care range is designed to make keeping a healthy pond easy, with simple-to-use products that are highly effective All pond care products have been developed by the industry's largest R&D facilities at Tetra's headquarters in Germany, and are subject to rigorous quality control procedures to guarantee their quality and consistency. This ensures piece of mind when advising customers which products to use HSE approved algaecide for blanketweed Directly suppresses blanketweed and other filamentous algae Harmless to fish, plants and wildlife Approved by the Health and Safety Executive (HSE 7695) - independently proven to suppress blanketweed growth and to be safe to fish, plants, and other pond inhabitants Also effective against green water Add at 4 to 6 week intervals to prevent blanketweed probl