[Biochemical Filtration] Suitable Tank: fish tank above 60cm / 23.62 inch. With an air pump as the power source, combined with mechanical filtration, the principle of biological filtration utilizes multi-level filtration to produce good things, and the sponge can absorb fine particles to achieve the effect of purifying water, the water flow is controlled by the airflow, which is small and slow and does not impact the fish. [Multi-Filtration Functions] This sponge aquarium filter combines bio-filtration, oxygenation and physical filtration in one and also makes small water flow, which can ensure the excellence of the water quality, helps your small fish or shrimp to live a happy and healthy life. Suitable for shrimp tanks, betta fish tanks, breeding ponds, goldfish, discus, crayfish, deep-fresh fish, juvenile fish or other fish. [Detachable Fine Sponges] You can easy to take down the sponges from the filter to clean or replace it, the sponges are fine not coarse, which means more surface area for beneficial little creatures to live on, don’t use tap water to clean it, just rinse or squeeze the sponges by using the aquarium water. Sponge diameter: 60mm / 2.36 inch. Sponge height: 125mm / 4.92 inch. Height of filter box: 45mm / 1.77 inch. Length of expansion pipe: 195~340mm / 7.67~13.38 inch. [Upgrade Filter] Aquarium filter can increase the amount of water dissolved, ultra-quiet, not easy to block, can be installed with filter material, multi-layer design of filter cotton, with a large surface area, full filtration without dead ends, the suction cup is strong and secure. [Easy to Use] All the parts of this filter are detachable, you can easily to assemble them together, with strong suction cups you can stick the filter firmly to any tank position under water, withouting floating, the water oulet tube can be extended and rotated, you can adjust the outlet to above or below the waterline.