Reach for the Undersink 10-Inch Carbon Block and Polyspun Replacement Water Filter pack when it's time to change the filters in your 10-Inch 2-stage undersink water filtration system. This 2-pack of filters features a carbon block filter and a polyspun sediment filter, which together provide excellent PFOA/PFOS, VOC, and chlorine taste and odor reduction. NSF/ANSI Standard 53 certified to reduce cysts such as Cryptosporidium and Giardia by mechanical means.