W100 wall mount Controller

Plug into more options in water treatment control!

Three powerful control outputs make the Walchem W100W a more versatile, high value choice among entry level water treatment controllers.
The W100W series provide an economical and reliable way to keep your water treatment program under control.

Key Features:

  • Large display with icon based programming makes setup easy
  • Universal sensor input provides extraordinary flexibility; the same controller can be used with almost any type of sensor needed
  • Multiple language support allows simple setup no matter where your business takes you
  • Three control outputs allow the controller to be used in more places than other entry level models


  • Complete flexibility in the function of each relay
  • On/Off Setpoint
  • Time Proportional Control
  • Pulse Proportional Control (when purchased with solid-state rel ays)
  • In-range or Out-of-range activation
  • Timer-based activation
  • Activation based upon the state of a contact closure
  • Timed activation triggered by a Water Contactor or Paddlewheel flow meter’s – accumulated total flow
  • Activate with another output
  • Alarm

Typical Applications:

  • Wastewater neutralization & disinfection
  • Food and Beverage disinfection
  • Potable water treatment
  • Swimming pools & spas
  • Boiler water treatment control
  • Cooling tower biocide control
  • Metal finishing & printed circuit board
  • Irrigation & fertigation
  • RO Systems
  • Condensate water treatment control