MULTI-CARBON SPONGE Bio Filter Wool Bio Filter Wool is made use of Polypropylene fiber for its optimal effect. Effectively filter out fine debris and particles matter with its highest quality of the Bio Filter Wool. Activated Carbon Sponge Make use of high quality of Activated carbon Effectively remove coloration, unpleasant odor, chlorine and other residue to improve water condition. Other items could you pls take a look at our website: