Perfect for using on your return pipe in your sump for , will also hold media such as . Made from high quality nylon mesh material on a plastic ring, all aquarium safe materials. For use in saltwater, tropical and freshwater aquariums. This filter sock can be cleaned and reused many times by simply running under a tap to clean out detritus from the material. QUALITY GUARANTEE: Best quality. Our Brand is dedicated to provide high standard products，we have confidence in our products and provide after sale support,if you have products quality issues, please contact us.