Bio Ceramic Media insert in the form of ceramic, porous rings, with a huge active (filtration) surface, which is formed by a complex network of channels and pores.
They are an excellent habitat for beneficial nitrifying bacteria of the genera Nitrosomonas and Nitrobacter. In their life processes, these bacteria use metabolic products that are toxic to fish: ammonia (Nitrosomonas) and nitrites (Nitrobacter).
Nitrifying bacteria oxidize ammonia and nitrites to the form of nitrates, which are much safer for aquarium inhabitants.
The bag contains 330g of media. That is enough for two large-size external filtration baskets.