Practical 50x50x4cm Biochemical Cotton Filter Black Foam Fish Tank Sponge Pads Aquarium Fish Tank Pond Sponge Physical Filter

Note:For the convenience of transportation, the biochemical cotton will be squeezed and slightly deformed. After receiving it, it will recover its original shape after being soaked in water for one day

Features: Biochemical sponge filter provides biological filtration to the aquarium, helps to stable water quality. Increase the oxygen solubility. Working noiselessly, very durable, can be used for years. Good permeability, easy to clean. Perfect filters accessories for your tank and aquarium. The foam can be cut and is suitable for all kinds of fish tanks. Speicificaitons: Product name: Aquarium Sponge Filter Color: Black (Show as picture) Sponge Size: 50cmx50cmx4cm Hole size: small hole(high density), M: medium hole, L: large hole (L size is the coarsest one) Reminder: 1. Soak the sponge in the aquarium water for 5 minutes before use, by doing this will help nitrifying bateria colonise easier. 2. Always use aquarium water under room temperature to rinse clean the sponge, never use hot water. 3. It must be used through connecting the air pump.