Features: 1.Biochemical Filtration: Biochemical filter sponge can quickly cultivate nitrifying bacteria, effectively decompose the residue inside the fish tank and decompose the fish excrement. 2.Improve Water Quality: The replacement aquarium biochemical sponge can adsorb fish tank dirt, filter water impurities, eliminate water odor and prevent water odor. 3.Quality Sponge: Fish tank filter sponge has good filtration effect, safe and non toxic, does not affect water quality, suitable for a variety of water quality environment. 4.Safe and Reliable: Filter sponge is suitable for a variety of fish tank environments, and young fish and shrimp do not have to worry about being inhaled, safe and reliable. 5.Easy to Clean: This replacement filter sponge is compact, portable, easy to clean and replace, an important part of creating a great environment for your fish. Specification: Item Type: Aquarium Biochemical Sponge Material: Filter Sponge Use: Fish Tank Filter Replacement Filter Sponge PackageList: 3 x AquariumBiochemicalSponges