GE TFM-18 18 GPD RO Reverse Osmosis GE Membrane w/ Ca Ware Pre & Post Filters FX12M Compatible 1 piece GE 18 GPD Membrane 1 piece 5 Micron Carbon Block Cartridge by CaWare Pre filter 1 piece 1 Micron Carbon Block Cartridge by CaWare Post filter GE FX12M compatible membrane , cheaper version