How to Put a Water Softener in Bypass—and Back in Service
Identify your softener bypass valve, check the correct positions, and learn what bypass changes, when to use it, and how to restore softened water.
A softener bypass routes incoming water around the softener while keeping water available to the house. In bypass, water does not receive the softener’s treatment; in service, it flows through the softener normally. Bypass is not the same as shutting off the home’s water supply. Whirlpool’s installation manual explains both arrangements.
Check the valve’s labels and your exact model’s manual before moving it. “Push in,” “turn clockwise,” and “turn both handles inward” apply to different designs—not to every softener.
Identify the bypass and its positions
Look where the two main water pipes connect to the softener, usually at the rear of the control valve. A separate three-valve bypass may instead be built into the nearby plumbing. Do not confuse the small brine tubing or drain hose with the inlet and outlet pipes.
| Bypass arrangement | Bypass position | Service position |
|---|---|---|
| Push–pull stem, as shown for Whirlpool WHES40/WHES44 | Push the stem fully in | Pull the stem out |
| Clack WS1 two-handle bypass, with red arrow-shaped handles | Both handles point toward the center of the bypass | Both handles point in the flow direction shown by the control valve’s engraved arrows |
| Culligan HE Cul-Flo-Valv, with blue knob | Turn clockwise until it stops; do not overtighten | Turn counterclockwise until it stops; do not overtighten |
| Separate three-valve plumbing bypass | Inlet and outlet valves closed; connecting bypass valve open | Inlet and outlet valves open; connecting bypass valve closed |
These positions come from the Whirlpool WHES40/WHES44 manual, Clack WS1/WS1.25 service manual, and Culligan HE owner’s guide, pages 26–27. Use them only when the installed bypass matches the description.
For a three-valve arrangement, trace the pipes: the bypass valve controls the connection joining the incoming supply to the outgoing house line around the softener. Do not identify valves by left/right position alone.
On a Clack WS1 bypass, moving just one handle does not create full bypass. The two mixed-handle arrangements are diagnostic and shutoff positions; the diagnostic position still admits water pressure to the control valve. See Clack’s bypass instructions, page 32.
When bypass is useful
- A leak from the softener itself: bypass can isolate the unit while maintaining household water. GE Appliances’ leak guidance recommends locating the bypass and following the model’s instructions.
- Little or no household flow: bypass is a useful isolation check. Culligan’s HE guide, page 27 recommends bypassing and requesting service when incoming pressure is available but water does not flow through the softener. If flow improves in bypass, that points toward a restriction in the softener path—not a diagnosis of a particular failed part.
- Outdoor watering through a softened line: Culligan recommends bypass for lawn sprinkling when the outside faucets are not already supplied by an untreated branch. Remember that whole-unit bypass also changes the water supplied indoors.
If you are investigating a fault, continue with the safe checks for a water softener not working.
Use bypass without opening the system
Move only the identified operating stem, knob, or handles. If a valve is seized, damaged, or unclear, stop rather than forcing it with improvised tools.
Bypass is not permission to remove clips, fittings, or valve parts. Water can remain trapped under pressure. Whirlpool specifically requires shutting off the water supply and opening faucets to depressurize the plumbing before removing inlet/outlet clips.
If leakage continues—especially from the bypass body or its supply connections—do not assume the leaking section has been isolated. Shut off the main water supply if you can safely do so and arrange service. Do not touch a wet plug or outlet.
Unplugging an electrically powered softener is not hydraulic bypass: it does not move the manual valve or reroute the pipes.
Return to softened-water service
After the fault or maintenance work is resolved, restore the exact service positions in the table and follow the model’s return-to-service procedure, including any required sanitizing and rinsing after service work. Move toward service slowly where instructed; Whirlpool’s filling procedure pauses to allow the softener to fill and prevent air pressure in the system. Check for leaks afterward.
Confirm treatment at a cold-water tap known to be downstream of the softener, after clearing the water left in the line. Compare its hardness with incoming water using the same test method; see how to check whether your softener works.
Do not use hot water as the first check. The water heater can retain water supplied during bypass, so restoring service does not instantly make all stored hot water soft. Whirlpool’s manual notes that stored hard water is replaced as hot water is used. If treated cold water remains hard, check the bypass positions first, then follow the model’s troubleshooting or regeneration instructions.