ASTRA Baktalysator introduces new and useful micro-organisms after changing the water, cleaning the filter or adding edication.These micro-organisms are particularly effective, because they remain active for longer thanks to a special production process. Reduces pollutants in the aquarium water (such as ammonium and nitrite). Stabilises and maintains the biological equilibrium in the aquarium water. Economical dosage: 10 ml Baktalysator to 100 litres water after each change of water; new aquaria can be used after 1-2 days.TIP: Dispense ASTRA Baktalysator straight into the filter chamber or into the water each time the water is changed. If establishing a new aquarium, add 20 ml of Baktalysator per 100 litres aquarium water, and add 10 ml per 100 litres of aquarium water over each of the following three days.