The Juwel BioPlus Coarse Filter Media for Aquariums is a coarse sponge that filters your aquarium mechanically and biologically. Because of the coarse pore structure, the surface area is large, ensuring a relatively high and even water flow velocity. This means that it is well-suited to biological filtering in the aerobic environment. The filter sponge's open pores were created without the use of chemicals, so there is no residue. It can be used in both freshwater and saltwater aquariums.
