RainSoft® division of Aquion Partners L.P. manufactures a complete line of water treatment and purification equipment. Since the RainSoft® Company was founded in 1953, it has concentrated on only one business—water treatment. Just recently, due to popular demand, we expanded to air-purification as well. RainSoft® is the oldest and largest American owned water treatment company. All products are manufactured in the U.S.A. The RainSoft® product line is backed by years of solid research and expertise, built only from top-quality components, and rigorously tested to meet the tough standards of nationally recognized, independent laboratories and certifying organizations.