If it is to raise small koi fish, you can use the ceramic biochemical ring. Ceramic biochemical ring is cheap and has a certain adsorption effect on the excreta and microorganisms of Koi. In addition, the price of the ceramic biochemical ring is affordable, which is equivalent to the beggar's version of the bacteria house, which can cultivate beneficial bacteria and promote the growth of Koi. If you are breeding big koi, you can use biochemical cotton, activated carbon and so on. The adsorption function of biochemical cotton and activated carbon is very strong, which is suitable for large fish tanks.
Koi can be said to use the external filter barrel, it should be noted that the filter barrel can not be cleaned frequently. Because nitrifying bacteria live in biochemical cotton and ceramic rings, they only need to pour water every time, and do not need to change filter materials. When the filter material is damaged, which will affect the filtering effect, the filter material can be replaced.
If you find that the physical filter material is dirty, you can clean it directly. As long as the filter material is not broken, it does not need to be replaced, and it can be used after cleaning. If biochemical filter material is used, it usually needs to be cleaned once a month. Physical filter material is because the dirty things are filtered directly from the physical filter material, and then adsorbed on the biochemical filter material, so the physical filter material needs to be cleaned frequently.
