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What is the bio filter?

Accelerate process nitrification the so-called biofilter can. By the aquarium biofilter any filter which does circulation of water through a substratum with bacteria can be named. Circulation to make very simply - of it are capable even inexpensive a pomp. Bacteria lodge on any substratum, whether it be walls of an aquarium, a plant or a ground. A problem that these bacteria demand for the ability to live oxygen, therefore can settle a layer no more than in some bacteria. Therefore it is necessary to give to bacteria a greater area of a surface that them was enough for process nitrification. We shall recollect, that density of landing of fishes in an aquarium in thousand times more, than in the natural nature, therefore and the area of a substratum for nitrification bacteria should be very big.
According to calculations of the leader in manufacture of the aquarian equipment, German firm Eheim, for one litre of aquarian water at average density of landing of fishes, it is required about 3 square meters of a surface for accommodation of enough nitrification bacteria. From here becomes clear why it is not necessary to name the biofilter those devices in which as a substratum for bacteria cutting plastic balls are applied. The area of a surface of such balls is very small. For the organization of a sufficient biofiltration it should to fill all aquarium with such balls.

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