The Omnipure Q5486 2.5" x 8" T28 GAC and Phosphate is an inline type of polyphosphate 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 rated to a level of 5 microns. It is best used with the Q-series head. The dimensions are 2.5 x 8 inches. It is one of the best water filtration cartridges for icemakers, RO systems, beverage systems, and refrigerators. The cartridge has a capacity of 6 months or 1250 gallons.