Stage 2 Granular Activated Carbon Filter for under-sink RO filtration drinking water system - 10 inch, 2.5" OD X 9-7/8" L (GAC-1025) * 2nd stage premium granular activated coconut shell carbon filter Removes chlorine, chloramines, tastes and odors, cloudiness, and colors Fits most industry standard 10-Inch under-sink filter housings Protechs downstream RO membrane