The Omnipure K5668-BB T33 GAC and KDF-55 is an inline type of cartridge. 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 uses 1 lb. of KDF-55 to remove the taste and odor of chlorine, algae, bacteria, and scale deposit. 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. The cartridge has a capacity of 1 year or 2000 gallons.