The Aqua-Pure AP817 is the recommended drop-in replacement filter for use with the AP801 (discontinued), AP801B , APWC801, whole house filtration system to help protect your pipes and appliances, while offering great tasting drinking water from anywhere within your home. Product Benefits Filters sediments and chlorine taste/smell 25 nominal micron particulate is captured on the rigid polyethylene outer shell 40,000 gallon chlorine reduction capacity at 10 gpm (AP817) and at 20 gpm (AP817-2) provides up to 6 months service for all your home’s water Radial flow design allows for the use of finer activated carbon, yielding a lower pressure drop Double open ended design fits all large diameter housings. Cartridge will filter water regardless of which way it is installed in housing. Soft neoprene gaskets on both top and bottom assisting in the prevention of unfiltered downstream water Polyethylene outer shell along with a granular activated carbon and polyKLEAN center core