The Omnipure K2553-KK Nitrate Removal 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. It uses the technology of ion exchange to give pure drinking water. The cartridge removes nitrates A520E along with the taste and odor of chlorine, acid neutralization, hydrogen sulfur, and iron. The dimensions are 2 inches x 10 inches. The cartridge has quick connect 3/8 inch FQC fittings for easy installation. It is one of the best water filtration cartridges for icemakers, RO systems, beverage systems, and refrigerators.