Tetra Bactozym capsules speed up the maturation of new aquarium filters. Add to all new filters and after cleaning established filters. For new aquariums add 2 capsules per 100 litres (22 gallons) of aquarium water placing the capsules directly into the filter. Repeat every 7 days. After cleaning the filter add 1 capsule per 100 litres (22 gallons) of aquarium water. It is recommended to use Bactozym in combination with Tetra SafeStart for the rapid maturation of new filters. 10 capsules in box.