Detailed Product Description aquarium filter /filtter mediaEasy to clean with best permeabilityIncrease the oxygen solubilityabsorb on the wall of fish tank,use envirmental protection sponge as filtration material,if use together with air pump,it can get doulbe eddects of adding oxygen and filteration,enhance the viablility of fish.1. brand new and high quality2. comes with multilayer structure ...