Tetra Algumin is a dual action treatment for algae in the aquaria. Can be used in aquaria containing fish and plants and is effective against green, red and brown algae. Contains natural peat extracts and the algicide monolinuron for the prevention and control of algae. The treatment works by darkening the water to inhibit algae growth and should be used both to treat algae issues and as a preventative. Instructions for use: - Shake well before use - Using the dosing cap provided add 5ml of Tetra Algumin for every 10 litres of aquarium water - Distribute the Algumin evenly over the surface of the tank and avoid placing the product directly onto any floating plants - Swtich off any UV clarifiers for maximum effectiveness If necessary re-treat 3-4 weeks after with half the normal dose.