Speeds up the maturation of new aquarium filters by creating an ideal environment for naturally-occuring bacteria. New filters lack waste-removing bacteria which can lead to pollution of aquarium water with harmful ammonia and nitrite. By speeding up the colonisation of the filter with bacteria Bactozym reduces the chances of water quality problems when setting up a new aquarium or replacing an existing filter. -Unique two-way action which removes harmful waste and speeds up filter maturation -Stimulates the decomposition of uneaten fish food using naturally occurring enzymes -Creates ideal conditions for the rapid development of filter bacteria by coating the filter in an artificial 'slime' layer -Helps to avoid the accumulation of harmful pollutants during the early stages of setting up your aquarium. -Also ideal for re-establishing filters that have been damaged -Ideal for use in combination with Tetra SafeStart