Feature: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 SpongeMaterial: Filter SpongeUse: Fish Tank Filter Replacement Filter Sponge.Package List:3 xAquarium Biochemical Sponges