Mars fishcare América del Norte 169B 16-oz. algaefixContains one (1) API POND ALGAEFIX Algae Control Solution 16 Ounce Bottle Effectively eliminates green water algae, string and hair algae, blanketweed algae and others Controls green water to keep pond water clean and clear in ornamental ponds and water gardens Use as directed to keep water safe for fish, pond plants, surrounding wildlife and pets Dose every three days until algae is controlled and then treat weekly