maintenance, care, compatibility
Bottom filter is not common in aquariums. It is difficult to clean and requires a primer with excellent water permeability.
However, among its advantages is the fact that it does not allow water to stagnate in the ground, which is especially important for plants.
The principle of such a filter is that water is pumped by a centrifugal pump or airlift. To the question – what kind of bottom filter for an aquarium is better, you can answer that the filter that is combined with aeration of water is better.
As for the bottom filter for the aquarium, in this case there is no big difference between the mechanical and biological filtration, since the bacteria settle on the filter material of the mechanical filter.
What is a bottom filter and how does it differ from its “brothers”? Gravel is taken as a cleaning base (as an option, quartz sand can be used in combination with a nylon thread), which is scattered over grids at the bottom of the aquarium. Thus, a hollow bottom is obtained, and water is pumped through with a pump connected to the lower cavity tube.
This device was invented in the 50s; at that time, it caused a lot of controversial opinions among aquarists. Some believed that this filter most closely matches natural processes. Water passing through the soil layer leaves all contamination.
With them, in turn, saprophytic microorganisms are cracked down.
The bottom filter for the aquarium works in such a way that the dregs and other sediments go where they would be in the natural environment. But the opinions of aquarists disagree on the question of “pumping or pumping fluid from the internal cavity?”.
The first bottom devices equipped with airlift pumped out water. With this principle of operation, the dirt settled on the top layer of soil.
Using pumps, the direction of fluid flow can be changed.
The only negative – pollution can cause obstruction in the internal space under the grate. That is why it is recommended to pre-clean the water using a tube on the inner filter.
The main problem associated with the use of such a device as aquarium bottom filters, is a fairly powerful stream of water, continuously passing through the soil. This phenomenon is not observed in natural conditions: there is no regular underground current in natural water bodies.
Washing the soil reduces the number of underwater plants. The fact is that nymphs or cryptocorins, for example, need an anaerobic substrate.
Washing the roots with water that is saturated with oxygen is detrimental to them.
In addition, the bottom filter is hardly suitable for aquariums with a large area. This is explained by the following: soil clogging requires a radical re-equipment of the “underwater kingdom”. In an aquarium with a small area, cleaning is much easier.
And owners of luxury “fish suites” should think about using such filters as internal and external filters.