1, upper filter cotton: filter cotton is the most basic filter material with the highest utilization rate. No matter what kind of filter, it is basically essential. The main function is to filter out a lot of waste such as fish excrement in the water, filter out the fish tank, and let the filter material behind him play a role.

2. The function of intermediate biochemical cotton: it mainly plays the role of biochemical filtration. Compared with cotton filter, it is dense, not easy to be damaged and much thicker, so there is enough space to parasitize nitrifying bacteria.

3. The function of the lower fungus house and ceramic ring: more nitrifying bacteria are parasitized by its special structure and pores. However, it does not have physical filtration function and must be used behind materials such as cotton filter.

4. If there is extra space to put another layer, you can put activated carbon and medical stone: the function is to use natural minerals to purify water.

Fish tank filter cotton (also known as biochemical cotton) is available in various colors, densities and hardness.

This kind of filter cotton has good air permeability and high mechanical strength. As a filter material, it has the advantages of low flow resistance and high filtration efficiency. Filter cotton can be washed repeatedly, which is durable, economical and environmentally friendly. Aquarium filter cotton is mainly used to filter waste and residue in aquarium or pool and improve water quality.