JBL Algol reliably removes green, brown, slimy, filamentous, floating and spot algae without copper! The effect is designed such that, although the result is only seen after a few days, the plants remain undamaged. JBL Algol does the water not clouding.JBL Algol+ 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!+ use: 10 ml/40 l water. Example with 60 l aquarium: 15 ml100 ml Algol are sufficient for approx. 400 litres of aquarium water.