Check the listing for details. SimPure CF RO Filter Replacement Cartridge For Model WP1 RO Water Filter System. Color: White, Condition: New. Listed at 19.99 USD. Only compatible Replacement Filters for SimPure WP1-100 Countertop RO water Filter System. Feature： 1.CF Filter: PP Sediment CTO Carbon Filtration，The CF composite filter removes rust, sand, odors, organic matter, residual chlorine and other radioactive substances in water effectively. Protects and extends the life of the RO membrane and filter system. 2.RO Filter: 0.0001 micron RO membrane, effectively remove salt, organic matter, heavy metals and other harmful substances in water. 3.Filter Lifespan：It is commended to replace the CF Filter 3-6 months to ensure the quality of the water. And the CF Smart Indicator Light will light up to remind you replace the filters. It is commended to replace the RO Filter 6-12 months to ensure the quality of the water. And the RO Smart Indicator Light will light up to remind you replace the filters. 4.QUICK CHANGE & TOOL FREE: The twist-in filter system makes the filter replacement a breeze and no tools required. The tool-free replacement save your time and energy. Your hassle-free life is our concern. 5.SERVING USA SINCE 2006 - Seattle, WA USA, SimPure dedicated in providing world-class quality of water filtration solutions. If you are not satisfied with your purchase, then we want to hear from you. Please contact our trained water specialists. And is available to answer any questions during the life of the product. Note:-To ensure the system gets adequately flushed before use, please follow the Manual or the Video on amazon page to flush the system 3-5 TIMES if you are commissioning the system for the first time. -The PH of purified water after filtration depends on the PH of your tap water. If the PH of your tap water is less than or equal to 7, then the filtered purified water is weakly acidic; If the PH of the tap water is greater than 7, then the filtered purified water may be weakly acidic or weakly alkaline. (It depends on the alkaline ion content of your tap water) Package List: Only One CF Filter: One CF Filter Only One RO Filter:One RO Filter 2* CF Filter &1* Ro Filter:Two CF Filter and One RO Filter 4* CF Filter &2* Ro Filter:Four CF Filter and Two RO Filter 6* CF Filter &3* Ro Filter:Six CF Filter and Three RO Filter