Cillit Flow Restriction Through Softener

Softener causes low water pressure or flow in the house, especially during service mode

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Clogged inlet/outlet strainers, Fouled resin bed, Undersized Cillit softener for demand, Partially closed isolation valves

How to Fix / Troubleshooting

Safety: Depressurize the system before removing strainers or opening the valve head.

  • Check valves: Ensure inlet and outlet isolation valves are fully open.
  • Clean strainers: Remove and clean the Cillit inlet and outlet strainers as described in E01/E07.
  • Bypass test: Place the softener in bypass. If flow improves significantly, the restriction is within the softener.
  • Inspect resin bed: If the unit is old or has been exposed to iron or sediment, the resin bed may be fouled. Consider replacing the Cillit ion exchange resin and cleaning the distributors.
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Repair Difficulty

Medium 3/5

Required Part

Cillit inlet/outlet strainers
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