How to Bypass a Water Softener (All Valve Types)
Last updated: November 6, 2026 · Based on standard softener valve designs and manufacturer manuals
To bypass a water softener, find the bypass valve where the pipes connect to the softener’s control head and move it to the “bypass” position. On push-button or knob valves, push or turn it until it is marked bypass. On a three-valve setup, close the inlet and outlet valves and open the middle (bypass) valve. Water then flows around the softener, so you still have water but it is not softened.
Knowing how to bypass your water softener is useful for repairs, filling a pool, watering the lawn or when the softener leaks. This guide shows the different types of bypass valves, step-by-step instructions and how to switch back.
Water softener bypass at a glance
- What it does: sends water around the softener
- Where it is: on the back of the control valve, where the pipes connect
- Common types: push-button, single knob or lever, and three-valve setup
- Water still on? Yes, but it will be hard water
What Is a Water Softener Bypass Valve?
A bypass valve lets you isolate the softener without shutting off water to the whole house. Most modern softeners ship with a plastic bypass valve attached to the control head. Older or custom installs often use three separate valves on the pipes, sometimes called a three-valve bypass loop.
When Should You Bypass a Water Softener?
- Repairs or maintenance on the softener
- A leak from the softener or brine tank
- Filling a pool or hot tub, or watering the lawn (to save salt)
- Plumbing work elsewhere in the home
- Running out of salt and waiting for a delivery
How to Bypass a Water Softener: Step by Step
Push-button bypass valve
- Find the valve on the back of the softener, where the inlet and outlet pipes connect.
- Look for the arrows or the words “service” and “bypass.”
- Push the button or rod in until it shows bypass. Some designs have two buttons that both need pushing.
Knob or lever bypass valve
- Find the knob or lever on the back of the control head.
- Turn it to the bypass position, usually a quarter or half turn. Arrows on the valve show the direction.
Three-valve bypass
- Find the three valves: inlet (water into the softener), outlet (water out) and bypass (between the two pipes).
- Close the inlet valve.
- Close the outlet valve.
- Open the bypass valve.
How to Take a Water Softener Out of Bypass
- Move the valve slowly back to service. For a three-valve setup, close the bypass valve, then slowly open the outlet and inlet valves.
- Open it slowly to avoid pushing air and pressure into the resin tank.
- Run a cold faucet to clear air from the lines.
- If the softener was off for a while, run a manual regeneration.
- After a few hours, test your water with hardness test strips.
Common Bypass Valve Problems
- Stiff or stuck valve: scale or dry O-rings. Lubricate the O-rings with a silicone grease made for potable water.
- Leaking valve: worn O-rings or a cracked plastic body. Replace the O-rings or the valve.
- Hard water after switching back: the valve may be partly in bypass; check that it is fully in service.
Still having trouble? See our water softener troubleshooting guide. Installing a new softener? Read how to install a water softener.
Frequently Asked Questions
How do I know if my water softener is in bypass?
Look at the bypass valve on the back of the control head. On push-button valves, the button or knob is usually marked “bypass” or “service”; on three-valve setups, bypass means the inlet and outlet valves are closed and the middle valve is open. If your water suddenly feels hard, check the bypass first.
Is it OK to leave a water softener in bypass?
Yes, for a short time. Your home will get hard water, but nothing is damaged. For long periods, such as a vacation, many owners simply leave the softener in service mode and unplug nothing.
Do I need to bypass my water softener to water the lawn?
It saves salt and soft water. Most outdoor faucets are plumbed before the softener already. If yours are not, you can bypass the softener while watering, but remember to switch it back.
Does bypassing a water softener turn off the water?
No. Bypass sends water around the softener straight to the house, so you still have water at every tap. It is the main shut-off valve that turns off the water.
Why is my water softener stuck in bypass?
The valve may be stiff from scale or old seals. Turn off the water, relieve pressure, and gently work the valve back and forth. If it will not move or it leaks, replace the bypass valve or O-rings.
The Bottom Line
Bypassing a water softener takes seconds: push, turn or switch the bypass valve to “bypass,” or close the inlet and outlet and open the middle valve on a three-valve setup. Your home keeps water, just unsoftened. Switch back slowly, run water to clear air and test your water to make sure the softener is working.
