The Omnipure K5655-BB-NRW37 DI Mixed Bed is an inline type of deionization cartridge that uses NRW37. An inline cartridge can be installed inline, even behind a refrigerator, for ensuring cleaner, better tasting water. The advantage of inline filters is that they can be easily installed wherever filtered water is required. The cartridge removes the taste and odor of chlorine, acid neutralizer, hydrogen sulfur, and sand. It uses the technology of ion exchange to purify water. It is rated to a 0.5 gpm. The dimensions are 2.5 x 12 inches. The cartridge has a quick connect 1/4 inch FPT fittings for easy installation. It is one of the best water filtration cartridges for icemakers, RO systems, beverage systems, and refrigerators.