The Whirlpool WHKF-GAC Granular Activated Carbon Water Filter reduces chlorine taste and odor and other contaminants for better tasting, cleaner water. The WHKF-GAC Filter Cartridge works in systems that accept a standard 10-inch x 2.5-inch water Filter. This cartridge works great for point-of-use applications such as undersink systems. Change the filter approximately every 6 months or when you notice a drop in water flow. UPC: 928448338247.