Alg Exit from Easy-Life will rid your freshwater aquarium or pond of algae such as beard algae, brush algae & string or thread algae. It is harmless to fish, crustaceans & plants. Alg Exit is very easy to use & you will rapidly see results – just add 10ml per 100 litres of water weekly over a period of four weeks. This can be extended if there is still algae present or if spores continue to germinate. You can also use Alg Exit as a preventative treatment. Add 5ml per 100 litres of water twice a week. Use in this way makes Easy-Life Alg Exit very effective. Dosage: Add 10ml per 100 Liter of water each week over a period of four weeks To prevent further infestation, add 5ml per 100 litres of water twice a week Instructions for use: Shake before use Treatment can be extended easily if there are still algae or spores present Remove active carbon before using Alg Exit Only for use in freshwater aquariums Warning: Use biocides with care. Active ingredient: salicylate. Do not add too much. Keep out of the reach of children & pets.