For beautiful freshwater aquariums: combats all algae species (even green water = floating algae) intensively. Application best in the morning (low pH). A partial water change of 30 % is recommended before use. Ensure there is sufficient oxygen content by aerating during the treatment. Repeat after 5 days if necessary. Combats all types of algae in freshwater aquariums. Without copper! Not harmful to fish and microorganisms when used correctly. Contents: 1 bottle Algol. To use: 10 ml/40 l water. Example with 60 l aquarium: 15 ml.