This replacement filter kit fits most standard under-sink reverse osmosis(RO) water filter systems including the GE GXRM10RBL, GXRV10ABL, and PNRV12, APEC ROES-50, PureDrop RTW5, RO5DX, Spring RCC7, Watts Premier 4SV, 5SV, and more. The carbon block filters reduce chlorine, lead, arsenic, select VOCs, and 13 other impurities. The reverse osmosis membrane filter can remove a wide range of contaminants, including dissolved solids. Keep your drinking and cooking water safe and great-tasting. Activated carbon block (CTO) filter made with 100% high-quality coconut shell carbon, the 50 GPD RO membrane produces 50 gallons purified water per day. For best filtration results, the carbon filter cartridge should be replaced every six months, and the RO membrane every 2-3 years depending on usage and local water quality. ON-DEMAND SUPPORT: Assistance is available from our experts, ready to answer any of your questions about your RO membrane. Have a concern or question? American-based customer support is available for the life of the product. Welcome to the Membrane Solutions Family.