Genuine Honeywell replacement filter kit for the Honeywell Reverse Osmosis system. The kit includes one each of the following twist-on cartridges:1) Sediment Cartridge 2) Reverse Osmosis CartridgeReplace once a year. Refer to page 9 of the Installation Manual for detailed instructions.Shown left, the Honeywell RO system has three cartridges, only two need replacement. This kit includes the two necessary filters and a water flow restrictor. The cartridges are high-lighted in yellow and labeled 1 and 2.