For cleaner, refreshing drinking water, the PUR® 20-inch 5 micron sediment filter reduces unwanted particulates such as sand, rust and dirt. 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. For best system performance, this filter is recommended to be replaced every 6 months.