External aquarium filters .ru
In small aquariums with few inhabitants, compact internal filters are usually installed.
However, if the volume of the home reservoir exceeds 100 liters, it is better to use more efficient external equipment for water treatment.
The device and principle of operation.
The external filter is a canister with filter material and a pump that continuously pumps water. Two hoses extend from the canister. Both of them descend into the aquarium: one by one the contaminated water enters the filter, and the other the purified water is pumped out.
When placing the canister above the water level, the pump is installed directly in the fish tank. Then it pumps water into the filter, from where the latter returns to the aquarium by gravity. The aquarium water entering the filter is subjected to multi-stage purification. A large foam or sintepon sponge absorbs dirt and thereby mechanically purifies the water. Activated carbon absorbs dissolved fish waste, and a layer of porous expanded clay serves as a medium for the propagation of beneficial bacteria that are responsible for biofiltration.
Advantages and disadvantages.
Before buying an external filter for an aquarium, it is important to soberly weigh its strengths and weaknesses.
The advantages of a cleaning device of this type include:
Long service life.
The drawback, in fact, is only one - higher price.
In addition, it should be borne in mind that with errors made during assembly, the filter may leak. Therefore, if you are not sure that you can install it correctly, it is better to call the wizard.
How to choose a device?
When comparing different models of equipment, pay attention to the following parameters:
Performance. For an aquarium with a volume of less than 100 liters, buy a filter with a capacity of about 300-500 l / h, with a larger volume - about 700 l / h.
The volume of the canister. The higher this number, the more filter material is placed in the canister and the cleaner the water. The number of compartments. The more of them, the more opportunities for experiments with different types of fillers. The required minimum is three to four compartments.
The thickness of the hoses. It is preferable to a tube with a large diameter, because sooner or later any hose is covered with an algae coating from the inside, which complicates the flow of water.
We hope that this material will help you in choosing equipment. This article was written with the support of the site.http://www.zoonemo.ru