Function: It’s a replacement filter for the Amway eSpring Water Treatment System, designed to purify drinking water by reducing contaminants. Filtration Technology: It typically utilizes a multi-stage carbon block filter to remove various impurities, including lead, mercury, VOCs, pesticides, and chlorine taste and odor, while retaining beneficial minerals. Replacement: The filter cartridge needs to be replaced periodically, usually about once a year, and the eSpring system often includes smart-chip technology to monitor filter usage and indicate when a replacement is needed.