Aquatic Life Inline KDF 85 / Catalytic GAC Cartridge for Indoor Gardening / Hydroponic Plant Germination. A high quality media consisting of a mix of KDF 85 and Granular Activated Carbon (GAC). Designed to remove or reduce iron and hydrogen sulfide from municipal or other water supplies. Also controls scale, bacteria and algae. The cartridge is used for the reduction of taste, odors and dissolved organic chemicals from water sources. The high surface area results in an exceptionally high capacity and efficiency. Operating Life: 1000 - 1500 GAL (depending on water quality). White cylinder housing with one 1/4" female pipe thread (FPT) connection port on each end.