For cleaner, refreshing drinking water, the Vitapur 20-inch 5 micron sediment filter reduces unwanted particulates such as sand, rust and dirt. Designed primarily for use in Vitapur Whole Home UV Water Disinfection and Filtration Rack Systems, 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.