WHKF-DB1 Whirlpool Undersink Replacement Filter CartridgeOwning a water filtration system that uses activated carbon to not only block sediment like dust, rust and sand, but one that reduces Giardia cysts and Cryptosporidium gives you peace of mind. Add to that the reduction of the taste and odor of chlorine, you know you have a good filtration system. This Whirlpool WHKF DB1 Filter Replacement has great performance in all of the above plus reduces volatile organic compounds for up to 1,000 gallons of water.