The Hydronix CB-45-2010 Replacement Carbon Filter has a high capacity for removing unwanted chlorine from your drinking water. It can also reduce certain volatile organic compounds (VOCs). Overall, it combines chemical contaminant reduction with great dirt-holding capacity. This replacement cartridge replaces the Liquatec CB-450-20-10 filter. The filter materials have been tested and certified by NSF International to ANSI/NSF Standard 42.