Maintain your water system with the iSpring F7-GAC for Standard 5-Stage Reverse Osmosis RO Systems 1-Year Replacement Supply Filter Cartridge Pack Set, which comes with 7 pieces. The 5-stage filtration removes rust, sediment, chlorine, organic contaminants and tastes from water. It's compatible with most RO systems, including Flowmatic, PuROLine and Crystal Quest. The kit comes with a variety of cartridges, such as 2 sediment, 2 activated carbon, 2 carbon block filters and 1 post carbon filter. Easily replace filters with the secure push-fit quick connection.