110194 Water Treatment System Carbon Replacement Filter (No UV Lamp, Does Not Fit eSpring UV Purifiers) Replacement filter allows beneficial minerals like calcium and magnesium to pass Water Treatment Systems&#44; with carbon block filter&#44; improves taste&#44; odor&#44; and Treatment System alerts you when it&apos;s time to replace the filter and resets itself Carbon Water Filter reduces more than 140 potential health-effect impurities. Filter has to be replaced once a year or after every 1&#44;320 gallons.