Ensure your water filtration system continues producing cleaner water efficiently with the Vitapur 20-inch 5 micron carbon block filter, designed to reduce chlorine taste and odor, for better tasting water. Designed primarily for use in Vitapur Whole Home UV Water Filtration Rack Systems, this filter can also be used in any filtration system that has 4.25" x 20" standard-sized filter housings. To keep your system operating at peak levels, replace this filter every 6 months.