Filter types: There are various types of filters in aquariums, including mechanical filtration, chemical filtration, and biological filtration. Mechanical filters mainly remove suspended solids and residual bait from water, chemical filters can adsorb harmful substances such as ammonia and nitrite, while biological filters maintain water quality stability by cultivating beneficial bacterial communities such as nitrifying bacteria.

Filter material: The selection of filter material is crucial for the filtration effect. Commonly used filtering materials include activated carbon, ceramic filter cartridges, sponges, etc. These materials can remove impurities, odors, and harmful substances from water.

Filtering effect: The effectiveness of a filter depends on various factors, such as the properties of the filtering material, the structure of the filter, and the flow rate of water. A good filter should be able to remove most impurities and harmful substances from water without causing adverse effects on aquatic organisms.

In summary, filters in aquariums are one of the important equipment for maintaining clean water quality. It is necessary to choose appropriate filter types and materials according to the actual situation to ensure the stability and suitability of water quality.