JBL FilterStart (Live Bacteria)Bacteria for the activation of new and cleaned filters for freshwater and saltwater aquariums, liquid. Fish and invertebrates need to feel as much at home in the aquarium as in the wild. Transform the aquarium water into biotope water for the good of your aquarium dwellers. When setting up a new aquarium and during partial water changes the aquarium needs beneficial bacteria to clean the water biologically and to quickly break down pollutants.