That the aquarium pleased a look, and its inhabitants always were healthy, he demands thorough leaving and use of the special equipment. One of obligatory attributes of a densely populated aquarium is the filter.
Aquarium without filter
Whether always in an aquarium the filter is necessary? No, if in it there are not enough inhabitants and about 10 liters of water are the share of one small fish up to 5 cm in size. In this case in an aquarium even without filter the biological balance will be established, and during regular removal accumulating at the bottom of garbage and weekly substitution 1/10 waters of fish and a plant will feel quite well.
In an aquarium without filter surely there has to be an aeration, it promotes water saturation by oxygen and to oxidation of hazardous substances. If the population of an aquarium is big, surely it is necessary to provide the filter.
Filters for an aquarium
There are several types of the filters used by aquarians. To protozoa the foam sponge which is put on the air spray is. The rising bubbles cause a weak current of water through a sponge, settle garbage particles on its surface. From time to time the sponge should be taken out and washed out accurately. Other version of the filter – air-lift. Principle of its action is as follows: the spray of air is located in a tube with a diameter of 1-2 cm. The lower end of a tube is at the bottom, top is removed in small to a ditch, located over a water surface at a back wall of an aquarium. In day ditches the set of small openings is drilled, from above they are closed by a small plastic grid on which the layer of sand 1-2 cm thick is filled. At aeration inclusion, water together with air flow on a tube gets in a ditch. In it it passes through sand and through holes in a ditch drops flows down in an aquarium. Such filter has several important advantages: first of all, it very well purifies water. Cleaning goes as mechanically, due to passing of water through sand, and as a result of emergence in sand of the bacteria decomposing hazardous substances. From time to time – for example, once a week, such filter is washed out. Namely, the accumulated garbage from above cleans up, time in several weeks it is possible to change the top layer of sand. Such filter will be even more effective in combination with the ground filter. On a bottom in this case the sheet of plexiglas with a set of the small openings drilled in it keeps within. In one of corners in a leaf the opening under an air lift tube becomes. Under a leaf linings that between a bottom and a leaf there was a distance not less than 1 cm are put. Linings should not interfere with current of water and also can be executed from plexiglas pieces. On the sheet of plexiglas the small plastic grid keeps within, soil from above is filled. During the work of an air lift water arrives from under a plastic bottom, at the same time all soil plays a filter role. Such filter not only perfectly purifies water, but also promotes growth of aquarian plants. There are also external portable filters providing very high quality of cleaning. Water can be pumped not only by an air lift, but also a special pomp. In shops it is possible to buy factory filters of any type, both internal, and external. The choice of the concrete filter is defined by density of population of an aquarium and preferences of the aquarian.