The CU and CU-S cartridges are replacements that are compatible with the CUNO Series CFS 8000 filter cartridges. Both incorporate a carbon block filter that reduces objectionable tastes and odors as well as chlorine and other contaminates, providing high quality beverage and ice. They also reduce extra fine dirt as small as 5 microns. Additionally, the CU-S provides for the reduction of scale formation.