JUWEL Filter Media bioPadJUWEL Poly pad is used to catch coarse particles of dirt in the water. As a mechanical pre filter, it protects the filter from rapid soiling and means that you don't have to clean the other filter media as often. JUWEL filter floss consists of fine, residue free polyester material and is suitable for use in both saltwater and freshwater aquariums. It comes in three sizes, in packages of up to 5. Features: Serves as a mechanical pre filter Protects