2.5 X 10" Three Stage Filtration System with Sediment, GAC and KDF Smart Media CartridgesSediment Our sediment melt blown filter cartridges are constructed of high quality polypropylene, designed to provide consistent flow rates and high dirt holding capacity. Sediments such as dirt, rust and silt are collected by the filter, allowing the treated water to flow and move onto the next stage of the filtration process. GAC Granular Activated Carbon (GAC) is an ideal solution to reduce organic and industrial chemicals in water. Certain