Materials: Unique eco-friendly design and noiseless filter operation.Easy to use: Using an air hose, one end to your air pump, and the other end to this filter. water flow.Easy to clean: Filter the two sponges of the filter to clean or replace, rinse and squeeze the sponges in the water in the tank, do not rinse the sponge with tap water or clean the sponges every two weeks or so.Safe and effective: Pitch filters provide both mechanical and biological filtration.Warranty: Any questions or concerns, please feel free to contact us so that we can do our best to solve it.Product descriptionPattern Name:XY-2820Features:1. The biochemical cotton filter is designed with high-quality materials and is more durable than any sponge filter on the market.2. This kind of living cotton is designed and manufactured with multi-layer principle, large surface area and has no obstacle to water flow.3. Easy to clean.4. This filter has no noise during operation.5. The dispersion stone can produce a large number of bubbles and increase the solubility of oxygen in water.