Fish Tank Filter – A device designed for the purification of aquarium water.
Purpose of Fish Tank Filters
Fish Tank Filters are designed for mechanical, chemical and biological water purification (filtration). The use of Fish Tank Filters for mechanical filtration – removal of suspended particles of sludge from water – is the most common. It should be noted that the design of the Fish Tank Filter implies a large surface of the filtering material, the surface of which is naturally (sometimes artificially) populated by bacteria. The bacterial community, in a normally operating filter, performs the biochemical conversion of toxic ammonia (the main product of nitrogen metabolism in fish and many other aquatic inhabitants) into less toxic nitrates. Chemical filtration is used if necessary to change the chemical parameters of water (hardness, acidity, dissolved substances), to remove drugs.
Classification of Fish Tank Filters
Entirely located inside the aquarium. Filters of this type are among the cheapest on the market of aquarium equipment both at the acquisition price and at the cost of maintenance. It has a number of significant drawbacks: it takes place in an aquarium, it requires regular cleaning of the filtering material about once a week, which is relatively noisy at work. By the principle of operation, they are divided into airlift, in which water is generated by air bubbles from the aquarium compressor and pump pumps, in which water is forcedly forced through the filter material with the help of a built-in pump.
Located outside the aquarium. The principle of operation is based on the passage of a slow flow of water through several trays filled with fillers and filter material. As a rule, it is located next to the aquarium, connecting with it by the hoses of intake and water outlet. Initial models of external filters are 3-5 times more expensive than internal ones designed for the same volume of the aquarium, which is their main drawback. Also, servicing of fillers and filtering material is much more expensive, which is partially offset by the low frequency of their replacement. The advantages include quiet operation, especially models designed for a small aquarium volume (40-80 liters), rare cleaning of filter material and fillers and, as a result, the presence of biological filtration. Filters of this type are very sensitive to cleaning or replacing fillers – cleaning of the filtering material is performed only in the water drained from the aquarium, and the complete replacement of the material is carried out in stages so as not to disturb the biological balance in the aquarium. This type of filter is mainly used by experienced aquarists.
In fact – a large external filter; oriented, respectively, on large aquariums or ponds. The advantages and disadvantages are the same as those of external filters.
It is a false, hidden by a layer of soil (sand), from under the false water with the help of a pump or airlift moves into the main volume of the aquarium. The filter material in this filter is an aquarium primer. Currently, in aquariums almost never used.
Some other types of filters are also distinguished, the main purpose of which is the removal or transformation of substances dissolved in water.