1. how high

is the water level of the upper filter fish tank? The water level of the upper filter fish tank is generally about four-fifths of the height of the fish tank. The upper filter tank uses a submersible pump, which must be completely in the water to work properly, otherwise the pump may be burned and damaged. The function of the submersible pump is to pump water from the bottom to the filter box above, and then put it back into the fish tank after layer by layer filtration, so as to complete the filtration. Compared with the bottom filter, its filtration effect is not particularly good, but it is very convenient to install.

Filter cotton: Filter cotton is usually the first layer of filter material, its role is to filter out impurities in water, mainly responsible for physical filtration. In the process of using, because the impurities will accumulate more and more, it will cause it to block slowly, affecting the efficiency of filtration, so it needs to be cleaned regularly, and if it is washed thin, it will be replaced with a new one.

2, activated carbon: activated carbon is generally placed in the second layer, after the filter cotton, its role is to adsorb ions in water, thus playing the role of water purification. It should be noted that activated carbon has an upper limit, which will not continue to adsorb after saturation, but will release these ions, so it should be replaced regularly.

3. Bacteria house: Bacteria house is different from other filter materials. It can not directly play the role of filtration, but it can provide a place for nitrifying bacteria to attach. With it, biological filtration can be completed. The bacteria house cannot be cleaned. If it must be cleaned, it must be washed in batches, otherwise it will destroy the original nitrification system.