Aqua Medic Biobacter   

biobacter is a compound containing freeze-dried living bacteria. It is used to start new biological filters, revitalize filters after using medication and to improve nitrification in existing aquaria. biobacter comprises a glass vial of bacteria and bacteria feed. 1 carton for 250 litres (app. 60 gallons).

For more information, visit the official website of the manufacturer.