The Clack® Control Valve is made in the USA and is a state of the art automatic valve which, is designed for residential, commercial and industrial use and is the water specialist valve for water filtration or softener systems.  They come in different program versions which are controlled by solid state microprocessors with front panel settings and screen display.  They can be configured easily for multiple tank use and cycles can be set for down flow or up flow regeneration or simply service, backwash and rinse and are the easiest valves to service in the industry.  They have a complete line of accessories including motorized alternating valves, no hardwater bypass, system controllers and flow meters.