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Duplex water softeners consist of two vessels filled with softening resin. In normal use one vessel is online (duty) while the other is off line (standby). You can choose a classic duplex system with one valve that operates both vessels or two simplex softeners with an alternating valve or an external controller. If two is not sufficient, you’ll need a multiplex. The Clack System Controller can operate up to 6 units.


  • System Controller may operate 2 - 6 units
  • Clack 1", 1.25" or 2" control valves may be used
  • No plug-in AC adapters required on individual valves, all connected valves will be powered by the System Controller (except for Impression Pro, TotalCare Pro & Evolve Pro)
  • System diagnostic and programming information for spreadsheet presentation may be uploaded to a standard USB drive
  • Two fused Single Pole Double Throw (SPDT) relay outputs are provided
  • Single demand-based meter is provided
  • Coin cell lithium battery backup for time of day
  • Solid state microprocessor with user-friendly front panel programming
  • Front panel displays for time of day, day of week, days untill next regeneration, current system flow rate and total system volume used (Totalizer)
  • Front panel LED status indicators for online, standy and regeneration
  • Ethernet connection
  • Modbus protocol, in function of building management systems
  • Circuit board has been modified to have Molex connectors for easy cable connecting

How To Order?

  • Necessary components for a Clack Multiplex system.
  • 1 x System Controller
  • 1 to 6 Clack valves (1” to 2” only)
  • 1 to 6 No Hard Water Bypass (one for each valve)
  • 1 to 6 Communication cables 8’ or 36’
  • 1 to 6 Power cables 15’ or 36’

Addition Information

  • Power cable is used to power valves from controller

Clack Valves System Controller

PriceFrom £5.79
Excluding VAT
  • Necessary components for the Clack Multiplex system • 1x System Controller • 1 to 6 Clack valves • 1x No hardwater Bypass per valve • 1x Interconnection cord per valve • 1x Power cord per valve

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