Clack Corporation is a FAMILY-OWNED 3rd Generation business and is one of the world's leading USA manufacturer serving the Water Industry for 75 years. Clack manufactures a wide variety of Control Valves 1" to 3", flow rates from 27 to 250gpm, distributed for use in water treatment equipment residential, commercial, and industrial applications. Products include filter media Birm, Filter Ox, Filter AG and Filter AG Plus, pressure vessels, distributors, retention tanks, brine tanks, brine components, R.O. systems, filter cartridges, proprietary line of control valves and accessories for all. We’re proud to offer products Designed, Assembled and Tested in USA, and products that are tested to NSF/ANSI 42, 44, 58, NSF/ANSI/CAN 61, NSF/ANSI 372.