GE | (FQ18PN) Reverse Osmosis Replacement Pre & Post Filter SetGuaranteed fit Compatible with select GE Under Sink Filtration Systems including GXRV40TBN, GXRQ18NBN, and GNRQ18NBN Premium filter Reduces 95 impurities including lead, select pharmaceuticals, select VOCs, and chlorine taste and odor Certified to NSF ANSI 42, 53, 58, 401, and P473 Certified by IAPMO Six month filter life Filter should be replaced every six months for best filtration results Features Filters down to 0. 5 microns The lower the microns,