Fish pond filters usually need to be opened 24 hours a day, but if the feeding density is not high, they can also be opened in stages. Filtration can keep the water flowing, so as to maintain the water quality, avoid excessive reproduction of bacteria and microorganisms, and promote the activities of fish, which is helpful to their health. If the filtration is turned off, it will not only affect the water quality, but also destroy the ecological balance in the pool, affect the survival of nitrifying bacteria, and reduce dissolved oxygen.

1. Filter cotton: Filter cotton is the main filter material in the filter, which is generally placed on the first layer and is responsible for physical filtration. Filter cotton can filter out impurities in water, thus making water clear. It should be noted that because it will be blocked after a long time, it should be cleaned with raw water regularly.

2. Activated carbon: Activated carbon is mainly responsible for chemical filtration, and there are many similar filter materials, such as zeolite, volcanic rock, ammonia-absorbing stone, etc., which can adsorb harmful ions in water, thus improving the water environment. However, because the adsorption of this kind of filter material has an upper limit, it is often replaced every once in a while.

3. Bacterial house: Bacterial house is generally used to contain nitrifying bacteria, which has no filtering effect, but nitrifying bacteria can absorb ammonia nitrogen and convert it into nitrate, thus improving water environment and avoiding fish from being poisoned.