Feature: 1. [High Density Holes] Aquarium sponge filter is high density porous fine sponge to prevent young fish from being sucked, providing a larger surface area for the growth of beneficial microscopic organisms. 2. [Enhance Water Quality] Aquarium biological sponge filter, which can trap floating debris and fine particles, keeping the fish tank clear and clean, closer to natural water quality. 3. [Easy To Install] Easy to set up, requires an air pump and airline tubing (not included), simply connect the airline tubing to the air pump and then connect it to the air inlet of this sponge filter. 4. [Multi Functional] Using this fish tank air filter can provide premium water flow in a solution that is both filtered and aerated, and allows the water to be fully oxygenated and heated. 5. [Easy To Clean] The fish tank double bio sponge filter is easy to clean, just remove the sponge, rinse and put it back into the water, it is recommended to clean the sponge weekly. Specification: Item Type: Aquarium Double Sponge Filter Material: Plastic, Biological Sponge Use: Fish Tank Filtration. Package List: 2 x Aquarium Filter Sponge1 x Connection Tube2 x Suction Cup