GOTD Aquarium Fish Tank Super Pneumatic Biochemical Activated Carbon Filter Using environmental high density sponge filter and high-performance activated carbon as filter material, can absorb dirt, quickly resolve fish feces and eliminate smell in water. combined air pump using, can improve water oxygen level, achieve oxygenation and biofiltration double effect, keep water clean Fix design of sucker. High-density sponge filter High-performance activated carbon Dimension: 8cmX7.7cmX7.7cm Easy and convenient to use