Clack Systems 30-70 gpm

Features Clack WS1.5 control valves

The Clack WS1.5 light commercial point-of-entry water softening systems are designed for applications ranging from 96,000 to 300,000 grains of hardness removal capacity at flow rates up to 70 gpm per tank with the 1-1/2″ valve. They can also be network configured from 1-6 systems utilizing the Clack System Controller to accommodate demanding, large water volume requirements.  Nelsen Corporation manufactures single and multiple tank systems with full documentation and O&M manuals.


Features and Benefits


1.5” top mount epoxy coated lead free brass valve suited for commercial/industrial applications


Features the Clack solid state microprocessor controller, combining simplicity with flexibility that is easy to set up for single and multiple tank applications.


A high quality strong acid softening (cation) resin with superior chemical resistance.


One-piece expanding seal spacer stack assembly and linearly reciprocating piston operation

Key Features

  • 1.5" top mount control valve suited for mid-size commercial/industrial
  • Epoxy-coated lead-free brass valve body
  • Economical stainless steel optional meter assembly
  • Service flow rate of 70 gpm, backwash 52 gpm
  • Solid state microprocessor with easy access front panel settings
  • Front panel display for time of day, days until next regeneration, volume remaining, current flow rate, and total volume used (Totalizer)
  • Four methods to initiate regeneration; meter immediate, meter delayed, time clock delayed, or pressure differential
  • Optional double backwash feature offers optimum regeneration, cleaning ability and efficiency
  • Fully adjustable cycle times with 6-cycle control delivers controlled backwash, downflow brining or upflow brining, slow rinse, second backwash, fast rinse, refill and downflow service
  • Coin Cell Lithium battery back-up with a 8 hour carry over
  • Level VI 15-volt output DC power supply provides safe and easy installation
  • Post treated water regenerant refill
  • One piece expanding seal spacer stack assembly
  • Linearly reciprocating piston operation
  • Reliable and proven DC drive

Additional Resources



System Skids - Nelsen Commercial Skids are pre-engineered and have an epoxy primer with an enamel finish coat in safety blue. 

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PVC Commercial Salt Decks - PVC Commercial Salt Decks are available for brine tanks 50" and under. A commercial brine grid that can endure the harsh environment of today's demanding water softening systems. The PVC grid plate and support structure are lightweight and corrosion resistant.

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Optional System Controller to allow Networking - Networks of up to 6 valves with options of Progressive Flow, Alternating, Random,  or Series

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HIGH FLOW DISTRIBUTION - Plastomer Diffusers or Hub & Lateral systems offer highly efficient distribution and collection of water and regenerants in water processing equipment.

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Find A Local Nelsen Water Solutions Dealer

• Capacities are based on resin manufacturer’s data • All flow rates are in Gallons Per Minute • All sizes and space required are in inches
**Space required and shipping weight are for single tank systems w/standard size brine tanks; multi-tank systems require additional spacing and are additional weight