Clack WS1.25CS Control Valve

Product Description

Clack's WS1 Automatic valve is a state-of-the-art control head designed for residential and commercial applications requiring flow rates up to 27 GPM (6.1 m³/hr). It has a backwash abilitiy capable of servicing up to 22" diameter tanks.

The valve acts as a primary center that directs and regulates all cycles of water softening or filtration. It can be set to perform downflow regeneration or simply backwash and rinse.

The valve comes in different program versions and is controlled by a solid state microprocessor with front panel setting and screen display.

The WS1 has 9 injector sizes to choose from for different draw rates.

Water Specialist 1.25" CS Control Specifications
Inlet/Outlet Fittings ¾" to 1.5” NPS
Cycles up to 6
Valve Material Noryl (1) or equivalent
Regeneration downflow
Flow Rate
Service @15 psi drop (includes bypass and meter) 34 gpm
Backwash @ 25 psi drop (includes bypass) 32 gpm
Cv Service 8.8
Cv Backwash . 6.4
Operating Pressures
Minimum/Maximum 20 psi – 125 psi
Operating Temperatures
Minimum/Maximum 40° – 110° F
Accuracy . ± 5%
Flow Rate Range. 0.25 – 30 gpm
Gallon Range 20 - 50,000 gallons
Totalizer 1,000 - 9,999, gallons
Dimensions & Weight
Distributor Pilot 1.32" OD Pipe (1" NPS) or 32 mm OD
Drain Line ¾” or 1” Male NPT
Brine Line 3 /8” or ½” OD Poly Tube
Mounting Base 2 ½” - 8 NPSM
Height From Top Of Tank 73 /8”
Weight 4.5 lbs
Electrical Specifications
Supply Voltage 120V AC
Supply Frequency 60 Hz
Output Voltage 12V AC
Output Current 500 mA
Tank Applications
Water Softener 6” – 21” diameter
Water Filter (2) .6" - 24" diameter
Cycles of Operation (Softener / Filter downflow)
1. Backwash 1st 6 - 16
2.Regenerate Draw/Slow Rinse (downflow) 45 - 75
3.Backwash 2nd (upflow) 3 - 12
4.Fast Rinse (downflow) 3 - 10
5.Regenerant Refill As Programmed
6.Service (downflow)  


  • Solid state microprocessor with easy access front panel settings 
  • Three modes of operation; meter immediate, meter delayed, or time clock delayed 
  • Double backwash feature offers optimum regeneration, cleaning ability and efficiency 
  • 73 selectable pre-programmed regeneration cycles 
  • Days override feature; 1 – 28 days available 
  • Backwash and brining ability to 21" diameter tanks 
  • Downflow regeneration
  • Stores system configuration and operation data in nonvolatile memory 
  • Coin Cell Lithium battery back-up with an 8 hour carry over 
  • 12-volt output AC Adapter provides safe and easy installation 
  • Patented one piece expanding seal spacer stack assembly U.S. Patent 6,402,944 
  • Patented linearly reciprocating piston operation U.S. Patent 6,444,127 
  • Control valve design provides optimum service and backwash rates 
  • Pre or Post treated water regenerant refill 
  • Reliable and proven DC drive
  • Residential and commercial applications
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  • 5
    Always in stock!

    Posted by Wilmin P. on Sep 23rd 2019

    I have been a faithful user of dow filmtec membranes for many years due to long-term consistency. Terrific products

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