Pentair Pentek CBC Series Cartridges are bonded powdered activated carbon (PAC) blocks that reduce unwanted bad taste and odor and chlorine taste and odor from potable drinking water. The CBC-10 carries a nominal 0.5 micron rating, making it an excellent choice for fine filtration and high-capacity taste and odor reduction in residential, food service, commercial, and industrial applications, including as a polishing filter or pre-filter. The CBC-10 measures 2.88 inches by 9.75 inches and fits standard 10-inch filter housings. With an initial pressure drop under 20 psi at 1 gpm and a temperature rating of 40 to 180 degrees F, it delivers dependable flow while maintaining its enhanced dirt-holding capacity. The cartridge is tested and certified by NSF International to NSF/ANSI Standard 42 for material requirements. This pack of 12 keeps replacements on hand for the cartridge, which is rated for more than 20,000 gallons of chlorine taste and odor reduction at 1 gpm. Replace the cartridge when you notice a drop in water pressure or water quality. After installation, flush the cartridge before use to clear any carbon fines.