Clack Corporation is one of the world's leading manufacturers serving the Water Treatment Industry for over 75 years. Clack manufactures a wide variety of Control Valves 1" to 3", distributes them for use in water treatment equipment for residential, commercial, and industrial applications. Products include filter media Birm, Filter Ox, Filter AG and Filter AG Plus, pressure vessels, retention tanks, brine tanks, brine components, reverse osmosis systems and a proprietary line of control valves.