Feature: 1. The sponge can effectively prevent the inhalation of shrimp and small fish, and prolong the use of filter materials.2. Prevent from entering the filter tank to reduce the filtering frequency. 3. Can clean the water inlet pipe, reduce sewage deposition, and reduce the attenuation of the filter . 4. The material has great thickness, it is and very suitable for using in freshwater and marine water. 5. Lightweight, softness design and excellent water permeability,dense shape makes it effective to avoid residue. Specification: Conditon: Brand New Item Type: Biochemical Filter Sponge Material: Cotton Color: Black Outer Diameter: Approx. 4.9cm/1.9in Hole Diameter: Approx. 2cm/0.8in Length: Approx. 9cm/3.5in Usage: Fit for aquarium filter Package List: 10 x Biochemical Filter Sponge |