Ensure your water filtration system continues producing cleaner water efficiently with the PUR® 20-inch 5 micron carbon block filter, designed to reduce chlorine taste and odor, for better tasting water. Designed primarily for use in the PUR® Whole Home UV Water Disinfection and Filtration Rack System PUVR15H, 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.