GE Appliances under sink reverse osmosis filtration system delivers premium filtered, great tasting water right from your faucet. The efficient filter reduces 95% of impurities in the water, including lead, select pharmaceuticals and VOCs, and the taste and odor of chlorine. The high-quality filter is IAPMO and NSF/ANSI 42, 53, 58, 401 and P473 certified. For maximum filtration and contaminant reduction, the filter should be replaced every six months. The replacement water filter is suitable for GE Appliances under sink filtration systems, including GXRQ18NBN and GNRQ18NBN.