Is My Water Softener Working?

How do you tell if a water softener is working?

You tell by measuring hardness on both sides of the softener at the same time. SoftPro's hardness test kit method (SoftPro, our store) compares a raw sample with a softened one from the same kit: a wide gap means the resin is removing hardness, and two similar readings mean water is going around the resin or the resin is spent.

1. Find a raw-water tap. Use an outside spigot or a tap plumbed before the softener. Many systems leave outside faucets on hard water; Pentair's 5600SXT manual shows them that way.
2. Find a softened tap. The kitchen cold tap is usual. Use cold water only, because a water heater can hold hard water for a while after a repair.
3. Flush each tap. Run each one long enough to clear standing water from the pipe; follow the flush and dip times printed on your kit.
4. Test both samples the same way. Use one kit, one method and the same timing for both, so the only difference is the softener.
5. Compare and write it down. Note both readings in grains per gallon (gpg) with the date. If your kit reads in mg/L, divide by 17.1.

For a reagent kit, Quality Water Treatment sells the Pro Products 2403 hardness field test kit (sold by Quality Water Treatment, our store) for checking softened and raw water at home, from $150 (October 2026). Per the store, the plastic case carries three 1-oz hardness reagents plus a square test bottle and measuring tube. See choosing a water hardness test kit for other options and how to test water hardness for the full method.

What hardness reading means a water softener is working?

A working softener brings water into the soft class, 0 to 1 gpg. Nebraska Extension's G1274 table, adapted from WQA and Interior Department figures, sets these classes:

The raw sample should sit well above the softened one. If raw water is already in the soft class, the softener has little to remove. City households can find raw-water hardness in the annual Consumer Confidence Report, which Nebraska Extension notes may list it.

What the sources say

• 0–1 gpgsoft water (0–17.1 mg/L)Nebraska Extension G1274
• 17.1 mg/Lequals 1 grain per gallonMontana State Extension
• 60–120 minfor brine to pass through and flush the tankNebraska Extension G1491
• 6–7 daysbetween regenerations in a worked examplePenn State Extension

What are the signs a water softener is working?

• Softened water tests soft. The softened sample reads in the 0 to 1 gpg band while the raw sample reads higher.
• Salt goes down. SoftPro's performance testing page (SoftPro, our store) says the salt level should visibly drop over time.
• The valve regenerates on schedule. On a Fleck 5600SXT the step display flashes while the valve moves between cycles. In Penn State Extension's example, a 20,000-grain unit for 4 people on 10 gpg water regenerates about every 6 to 7 days.
• Water use registers. On a metered Fleck valve, the flow indicator flashes when water runs. Holding Up with Extra Cycle for 5 seconds opens diagnostics, where flow rate and gallons used appear.

What are the signs a water softener isn't working?

• Raw and softened readings match. This points first to the bypass. Quality Water Treatment warns that bypass knobs not completely open let unsoftened water through.
• Salt level hasn't moved in weeks. Unchanged salt plus hard water points to a regeneration problem. Check for a salt bridge first; see why a softener isn't using salt.
• Hardness creeps back before the next regeneration. The hardness setting may be too low for your water, so the valve thinks it has capacity left when it doesn't.
• The display is blank or the time flashes. The Fleck manual says the time flashes after a power failure, and missed regenerations wait for the next set time.
• Hard water only from hot taps. The Fleck 5600SXT manual lists hardness held in the water heater; flush it repeatedly. Cut the heater's power or gas before you flush, watch out for scalding water, and use the heater manufacturer's steps.

Can a TDS meter tell if a water softener is working?

No. Montana State Extension explains that softening does not reduce total dissolved solids; it swaps calcium and magnesium for sodium or potassium. A TDS meter does not measure hardness, so a high reading does not mean the softener failed. Use a hardness test.

What should you check if the softener fails the test?

Work through these in order. Each links to a fuller guide.

1. Bypass. Turn it fully to service. On a Fleck plastic bypass the knobs line up with the inlet and outlet pipes.
2. Salt and bridges. The tank should be a quarter to half full with pellets sitting higher than the brine. Break any crust with a broom handle; steps are on the salt bridge page.
3. Hardness setting. Enter your raw-water reading in gpg. Our settings guide covers iron compensation and reserve.
4. Brine draw. If salt is present but never used, the injector or brine line may be clogged.
5. Regenerate and retest. Run a manual regeneration, then test again the next day.

If none of that fixes it, the full troubleshooting guide covers valve seals and resin in order.

Related guides

• SettingsWater softener regeneration explained
• MaintainWater softener maintenance checklist
• SettingsHow often a softener should regenerate

Common questions