JBL ProClean Bac contains live cleansing bacteria for immediate aid of aquarium pollutant problems. The beneficial bacteria remove toxins such as ammonium, ammonia and nitrite. During the start-up phase, the filter becomes biologically active faster, the aqaurium water quickly becomes clear and clean. JBL ProClean Bac always used after filter cleaning, water change, refurbishment, etc. After treatment with fish medicine, JBL ProClean Bac ensures the bacterial flora in filter and aquarium garvel quickly recovers.JBL ProClean Bac+ for healthy fish and clear, clean aquarium water+ use: shake disposable cartridge, open and put entire content into the aquarium+ ideal for 60-200 litres freshwater+ can not be overdosed+ always use after: water change, filter cleaning, medication and adding of new fish+ breaks down ammonium/ammonia and nitrite+ supports the filter and reduces sludge (dirt on the ground)+ package contents: 1 disposable cartridge with 50 ml concentrate of living cleansing bacter