API Pond Melafix allows you to be proactive with your water treatments for prevention. A garden pond requires treatment because they are closed systems, so fish waste and other toxins do not get carried away from the pond. To keep your wish and plant life thriving, and your water clear, use API Pond Melafix. This Pond Fish Bacterial Infection Remedy uses tea tree as an antibacterial to treat infections including open wounds, tail/fin rot and ulcers. To reduce the risk of disease outbreak when a fish is added to your pond, this remedy can be used as well. For use on freshwater or saltwater ponds only. Not for aquarium use. Within four days of treatment, tissue re-growth and healing can be observed. Safe for snails, wildlife, and aquatic plants. Treat your pond to the healing effects of API Pond Melafix.