Kinetico brand Water softener bypass valve (C) Daniel FriedmanWater Softener Bypass Valve Operation & Repair
Put the water conditioner in or out of service

  • BYPASS VALVE on WATER SOFTENERS - CONTENTS: How to Use & Set the Water Softener Bypass Valve. How to Place the Water Softener Out of Service or Off. How to return the water softener to use or operation. How to Fix a Leaky or Stuck Water Softener Bypass Valve. Rotating Bypass Valves on Water Conditioners - Water Softeners. Autotrol Water Conditioner Bypass Valves. Piping Arrangement & Valve Location for Manual Water Softener Bypass. What About Turning off Electricity to the Softener to put it temporarily out of service?
  • POST a QUESTION or READ FAQs about how to put the water softener or water conditioner into bypass mode.

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Water Softener Bypass Valve Operation & Repair Guide:

This article explains how to use & repair the water softener or water conditioner system bypass valve. We explain what is the bypass valve on a water softener & where to find it, and we describe when & how to position the valve to take the water softener/conditioner in or out of service.

We detail how to shut down or turn off a water softener - avoid leaks, wasted water when not in use and we answer the frequent question of Which way do I push or turn the water softener bypass valve? Examples are given of various water softener bypass valve types including Autotrol, Culligan & Kinetico water conditioner bypass valve operation as well as standard plumbing valve arrangements.

We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.

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How to Use & Set the Water Softener Bypass Valve

Water softener bypass valve (C) Daniel Friedman

The water softener bypass valve is normally included as part of the control valve assembly on top of the water softener media tank (the smaller tank that handles the actual ion exchange that is the real work of a water softener).

[Click to enlarge any image]

Article Contents

How to Place the Water Softener Out of Service or Off

If your water softener has a manual bypass valve (photo at page top and sketch at left), you can temporarily take the water softener "out of operation" - that is, you can put the the valve into bypass position so the water softener is not in the piping loop at all.

When the water softener is on "bypass" water used in the building is not passing through the water softener - the unit will not be treating the building water supply.

Bypassing the water softener and turning it off when the building water supply is not going to be in use removes one more possible source of freeze and or leak damage and it also isolates the water softener equipment from the rest of the building water supply piping.

How to return the water softener to use or operation

To restore the water softener bypass valve back to its prior position (such as restoring the water softener to in-use) simply push on the now protruding knob found on the other end or other "side" of the bypass valve.

How to Fix a Leaky or "Stuck" Water Softener Bypass Valve

In our experience these manual bypass valves work pretty well on most water softeners, but on occasion we find one that is leaking. Usually the valve was just fine (not leaky) until we disturbed it. You may need to ask for bypass valve repair assistance from a water conditioner service company, but a few repair details below may help.

Water softener bypass valve parts  - CulliganLubricate the water softener bypass valve? The bypass valve on a Culligan™ water softener (and probably most others) connects to the back of the main control valve assembly with two screws.

If the valve is difficult to operate it may need lubrication. Inside are o-rings that permit the valve to operate without leaking.

If these parts appear to need lubrication, use a silicone-based lubricant, not a petroleum-based lubricant which could damage the control.

Leaky Water Softener Bypass Valve? the bypass valve shown in this sketch from a Culligan water softener installation manual includes replaceable o-rings that may be needed if your bypass valve is leaky.

The process of returning a water softener to service in a winterized building is detailed at Restoring Water Treatment Equipment - How do We Return the Water Softener to Operation & Use at the End of Winter?

Autotrol Water Conditioner Bypass Valve Operation

Some water conditioners such as the Autotrol Series 255 use a different (and optional) bypass valve that has two individual knobs that must be turned to switch between in-service and bypass modes - shown at below-left.

Autotrol bypass valve Autotrol bypass valve

The sketch at above left shows the optional Autotrol Series 255 Valve / 460i bypass valve. Adapters are available to permit connections to various sizes of copper, NPT (threaded), plastic, and brass water piping.

The second sketch (above right) shows the position of the Autotrol bypass valve handles when the water softener is placed in service "Not in Bypass" and "out of service "In Bypass".

Remember that if an additional external manual bypass valve is "open" (on bypass or in bypass) you will need to also close that valve when the water softener is returned to service ("off bypass").

Culligan Water Softener Bypass Push-Push Valves

Water softener bypass valve (C) Daniel FriedmanIn the Culligan sketch at above left and in our photograph at left the water conditioner bypass valve is that horizontal tube at the left side of the sketch. (Other water softener brand bypass valves are discussed in the article below.)

Culligan calls this the Cul-Flo-Valve® and suggest that when you are using the valve it should be pushed slowly. Usually there is a blue (on) or red (off) or a green (on) black (off) knob on this control. Some however use black knobs but mark them as ON (in = on) or OFF (in = off).

Pushing in the blue knob on the valve is turning the water conditioner on and allows water to enter and fill the media tank - thus putting the unit in use.

The Culligan bypass valve shown above is operated simply by pushing in on the valve end whose valve stem is visible - or in the "out" position. Our pen is pointing to the valve stem.

When you push horizontally on this bypass valve end (the black knob in our photo) the valve slides - in this case from right to left. You will see that a corresponding valve or knob on the other end of the bypass valve will move "outwards" at the same time.

Most water softener models using this "push-push" style of bypass valve include colored knobs on each end of the valve as well as text on the knob that indicates whether or not the valve is in "on" position or "bypass" position.

Fleck / Pentair Water Softener Bypass Valve: In Service or On Bypass Positions

These photographs illustrate the in-service and out-of-service or "bypass" positions of a lever type water softener bypass control valve on a Fleck water softener. The installation of this water softener is also illustrated at SOFTENER RESIN REPLACEMENT and it is discussed further also at WATER QUALITY & QUANTITY San Miguel de Allende.

Fleck water softener bypass control valve before installation (C) Daniel Friedman

Above, the bypass control valve for a Fleck water softener, before installation. The arrows and the pointer on the bypass valve handle indicate the positions of the control handle to put the water softener into service (in use) or into bypass mode (out of use).

Below: the Fleck brand water softener bypass valve set to SERVICE, meaning that the softener is "in use". Note that I've coloured the arrow on the bypass valve handle with black magic marker to make clear that it is pointing to the SERVICE mode on the valve body.

Fleck water softener bypass valve in the SERVICE or "in use" mode (C) Daniel Friedman

Below: we show the Fleck water softener bypass control valve set to BY PASS or "out of service"

Fleck water sofener bypass valve in BYPASS or out of use mode (C) Daniel Friedman

Watch out: You'll notice that in order for the water softener bypass control valve handle to rotate successfully past one of the plastic, heat-welded water pipe fittings at the water softener, we had to bend the end of the bypass control valve lever to a 90 degree angle.

If you have to make an adjustment like this be sure to first remove the handle from the valve, then complete your bend. Otherwise you may damage or even ruin the bypass valve's internal parts. Oops!

Kinetico Rotating Bypass Valves on Water Conditioners - Water Softeners

Kinetico water conditioner bypass valve (C) Daniel Friedman

Other water softening equipment may not use the Push-Push type of bypass valve we illustrated above on Culligan Equipment.

The Kinetico water conditioning equipment Mach Series uses a rotating bypass valve shown in our photo at page top and again at left.

[Click to enlarge any image]

Look closely at the photo and you'll see red and green labeling instructions that explain which way this valve is turned to place this water conditioning equipment on "bypass" and which direction the valve is turned to restore it to operation.

See that white arrow to the right of the valve handle (the handle is in a "vertical position)? The tiny green arrow showing in the window pointed-to by the white arrow shows that this unit is in operation.

If the bypass valve is turned until the yellow arrow is showing in the indicator window, this water softener is in "bypass" position.


Pro-Tec Water Softener Lever-Type Bypass Valve Operation

Water Softener Bypass Valve (C) Daniel Friedman mark Klug Water Softener Bypass Valve (C) Daniel Friedman mark Klug

The water softener shown above, installed in a Surprise Arizona home, was placed by Pro-Tec Water Softeners ( You'll see a similar bypass valve on Fleck and Pentair water softeners too.

This bypass control valve is plainly marked as "Service" and "Bypass" - just turn the red handle to point to "bypass" to take the water conditioner out of service. Our photo of the water softeners control dial shown below also includes an "In-Service" indication on its control dial. [Click to enlarge any image]

Pro-Tec water softener control dial (C) Daniel Friedman Mark Klug

Piping Arrangement & Valve Location for Manual Water Softener Bypass Valves

Manual bypass for water softener hookup - Culligan

As this sketch from a Culligan water conditioner installation manual shows, a water conditioner, or any water treatment equipment for that matter, can be installed with piping that includes a manual bypass valve (top center in the sketch). We use this piping arrangement at water filters, for example, not just water conditioners.

The small cost of installing that extra manual bypass valve (and the two service valves shown as outlet valve and inlet valve in Culligan's sketch) means that you can service, repair, or even completely remove the water softener (or other water treatment equipment) when needed, without interrupting water supply to the building.

The Outlet valve and Inlet valve are both closed (turned clockwise) and the bypass valve is opened to achieve this condition.

Watch out: do not leave off the water softener indefinitely. As we explained at SOFTENER ADJUSTMENT & CONTROLS, a water softener is not there just for fun.

If your water is hard and you leave the water conditioner off completely, you can expect to face expensive plumbing repairs when the water supply piping, water heater, or tankless coil become clogged with minerals.

[An exception might be if your building is converted from using a private well with hard high-mineral content water to a municipal water supply hookup whose water is low in mineral content. In that case you might no longer need the water conditioner.]

What About Turning off Electricity to the Softener to put it temporarily out of service?

What's the difference between using the water softener bypass valve and simply pulling the (electrical) plug to turn off power to a water conditioner?

Functionally either step is might or might not be the same, depending on the brand and model of your water softener.

Some water softeners do not use any electricity so turning off electrical power is moot: use the bypass valve, Luke.

On a water softener whose control head uses electrical power, when you turn off electrical power (or pull the plug) to a water softener, water is still passing through the equipment.

So, for example, if your water softener is leaky and needs repair, or if you are shutting down the system in order to clean it, you might be better off using the bypass valve to stop water from flowing through the system. use the bypass valve, Luke.

Also see our advice on using the water conditioner bypass valve during winterizing or de-winterizing a water softener when taking steps to protect building plumbing from freezing. See these details on water softener bypass valve use at WATER SOFTENER / TREATMENT TURN OFF and at WATER SOFTENER / TREATMENT TURN-ON.


Continue reading at SOFTENER ADJUSTMENT & CONTROLS or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.





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