The Omnipure Q5333 2.5" x 6" T33 Acid Wash GAC Carbon 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 removes the taste and odor of chlorine, lime, and scale deposit. It is rated to a 0.5 gpm. It is best used with the Q-series head. The dimensions are 2.5 x 6 inches. 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 1250 gallons.