Watts (WCBFF975) 10" x 4.5" Big Blue Coconut Carbon Block 5 Micron FilterThe Watts WCBFF975 is a 10" x 4. 5" Big Blue coconut shell carbon block filter cartridge that removes up to 99% of chlorine, taste, odor, and sediment at 5 microns. Built with thick wall carbon construction and 100% coconut shell carbon, this cartridge outperforms standard GAC filters with superior chlorine reduction, lower pressure drop, and no channeling. SPECIFICATIONS Core Filter Specs Dimensions 10" 4. 5" Big Blue size Filtration 5 Micron Carbon