Kinetico water Filter Replacement Set comprised of two Replacement Water Filter Cartridges in a Pack (both pre and post cartridges) Set contains: 1 x 9461A High Efficiency Carbon/Sediment Pre-filter Cartridge 1 x 9306B Granular Activated Carbon Post filter Cartridge The 9461A is designed for the reduction of sediment and chlorine during the prefiltration stage. The 9306B is designed for the post filtration. Suitable for the Kinetico K5, A200 Aqua-Kinetic Reverse Osmosis & the Kinetico K2 Drinking Water Station. Expected filter life (1800 Approx).