Fluval Carbon Media is perfect for use with the complete range of Fluval External Filters including the Fluval 105, 106, 107, 205, 206, 207, 305, 306, 307, 405, 406, 407 Canister Filters. This genuine Fluval high quality Carbon Filter Media is also suitable for use with the Fluval FX2, FX4, FX5 and FX6 Filters. The premium research grade, low ash Fluval Carbon is highly porous, providing large amounts of surface area for adsorption of impurities. It effectively removes heavy metals, odours, discolourations, organic contaminants and pollutants to leave your aquarium water crystal clear and sparkling. Fluval Carbon does not raise phosphate levels. For use in freshwater and marine environments. Genuine Fluval filter media Biological filter media Premium research grade low ash carbon Removes heavy metals, odours, discolouration and organic contaminants Creates sparkling, crystal clear water Highly porous and absorbent, last longer Does not raise phosphate levels For freshwater and marine environments For best results, replace every 4 weeks Available in sizes; 300g, 375g & 800g