Filter is needed for fish culture in large-mouth ceramic jar. No matter what kind of fish tank, the effect of filtration is definitely better than that of no filtration, so it is best to install one for filtration, so as to maintain the water quality, and the fish can be raised well when the water is good. Usually, this kind of large-mouth ceramic tank is more suitable for raising some small-sized wide-temperature fish, such as goldfish. If the number of fish raised is small, the water quality can be maintained well without filtration.

1. Physical filtration: Among various filtration methods, physical filtration is an essential one, which is mainly responsible for filtering impurities in water. The usually used filter material is filter cotton. It should be noted that because it takes a long time, the filter material will be blocked, so it needs to be cleaned regularly, but it must be cleaned with the original tank water.

2. Chemical filtration: There are many kinds of filter materials for chemical filtration, such as activated carbon, ammonia absorbent, zeolite, etc. Their usage is similar. Basically, they are put in fish tanks and then slowly adsorb harmful ions in water. However, it should be noted that these filter materials are saturated, so they should be replaced regularly.

3. Biofiltration: Biofiltration mainly cultivates some nitrifying bacteria, which can convert ammonia nitrogen in water into nitrate, thus preventing fish from being poisoned. When culturing nitrifying bacteria, we should pay attention to turning off the lights and exploding oxygen, so as to accelerate its growth and reproduction.