The Everpure 4CB5 Carbon Block Prefilter reduces dirt and other particles as small as 5 microns from your water, in addition to reducing the taste and odor of chlorine. This cartridge can deliver clean, better tasting water to many foodservice, vending and office coffee service applications. The cartridge will not remove flouride from water. The 4CB5 is also used with Everpure's QL2, QL3 and QC71 filter heads, as well as Everpure's MRS-20 Reverse Osmosis System. The internal filter is never exposed to handling, and thus is not easily contaminated.