Nature 2’s A Cartridge provide pool owners with a way to reduce their chlorine use without resorting to other harsh chemicals, simply by adding this plug-in cartridge to their pools water. Designed to be used with Nature 2 Systems, A Cartridge utilizes all-natural minerals to purify water, eliminating much of the chlorine odor and irritation associated with chlorine. With your pool using dramatically less chlorine, you will lower your maintenance costs while improving overall water quality.