FQK1K Refrigerator Water Filter Cartridge FIT GE  FIT - Compatible with filtration systems GXK185K, GXRLQR, GXRLQ and GX1S50R ADVANCED FILTER - Reduces lead, select pharmaceuticals, select VOCs, chlorine taste and odor and other impurities CERTIFIED TO NSF/ANSI 42, 53, and 401 - Certified by IAPMO SIX-MONTH FILTER LIFE - Filter should be replaced every six months for best filtration results FILTERS DOWN TO 0.5 MICRONS - The lower the microns, the more contaminants are caught and reduced