# water softener salt troubleshooting

> Salt bridge, salt mush, or a tank that never draws? Work through the brine tank in order. See the causes, fixes, and $10-$150 repair costs.

Canonical: https://watertreatmentpro.com/water-softener-salt-troubleshooting/

Last updated: 2026-11-09

Salt problems come down to four: a bridge, mush, overfilling, and a blocked brine line. All four leave the tank looking normal while the softener passes hard water. Most fixes cost under $50 and take an hour.

## The tank can lie to you

A brine tank is opaque or semi-opaque, and the salt surface is what you see from above. Neither tells you what is happening at the bottom.

A bridge is a crust across the top with a void beneath. The tank looks full and draws nothing.

Mush is the opposite: salt has dissolved into sludge that smothers the pick-up. The tank looks low and wet, and the brine is weak.

Overfilling compacts the lower salt into a solid mass that dissolves slowly and unevenly.

## The symptom table

| Symptom | Likely cause | Fix |
|---|---|---|
| Tank full, no soft water | Salt bridge | Break crust, regenerate |
| Tank low and sludgy | Salt mush | Empty, clean, refill |
| Brine line dry during draw | Blocked injector or line | Clean screen, flush line |
| Salt use doubled | Regeneration frequency | Reprogram |
| Water hard after refill | Air in brine line | Run two manual cycles |

The first two rows account for most salt-related service calls, and both are visible once you push a stick into the salt.

## Diagnose in this order

1. Push a broom handle down through the salt and feel for a void.
2. Look at the water level in the tank against the salt line.
3. Start a manual regeneration and watch the brine line.
4. Check the injector screen on the valve.
5. Inspect the brine line for kinks or salt crust.
6. Confirm the float moves freely in the brine well.

That sequence takes 20 minutes and identifies the cause in nearly every case.

### Testing for a bridge

A bridge feels solid at the surface, then the stick drops several inches into empty space.

Break it by pushing the stick through in several places, then run a manual regeneration. The resin has been running on weak brine for weeks, so one cycle may not restore full capacity.

If the bridge returns within a few months, reduce the fill level and check the room's humidity.

## Clearing mush

Mush needs the tank emptied. A wet-dry vacuum is the fastest way, followed by a scoop for the compacted material at the bottom.

Scrub the walls, rinse, and check the brine well for sludge that has migrated inside.

Refill with pellets rather than rock salt, and keep the water level at the manufacturer's mark rather than filling to the top.

## Brine line and injector

The injector screen is a small mesh part behind a cap on the valve. Salt residue clogs it, and the symptom is a brine draw that never starts.

Remove the cap, pull the screen, rinse it under a tap, and reinstall. A 10-minute job that fixes a large share of "dead softener" calls.

The brine line itself can crust internally. Disconnect it at both ends, flush with warm water, and check for flow. A replacement line costs $10-$20.

## Programming problems that look like salt problems

A softener set for 20 grains on water that tests at 8 regenerates more than twice as often as needed, which doubles salt use.

A unit set for 5 grains on water at 12 runs out of capacity before the next cycle, which looks like a salt failure.

Check the hardness number against a lab test, then check capacity and reserve. A metered valve needs gallons and hardness; a timer valve needs days and time.

### What the fix should prove

After any salt fix, run two manual regenerations and test hardness at a cold tap. One cycle may not restore full capacity if the resin sat on weak brine for weeks.

Write the result down. A number that stays under 3 grains per gallon for a month confirms the diagnosis; one that climbs again means the brine draw is still failing.

If the tank was bridged for a long time, expect the first regeneration to take longer than usual as the valve draws a full brine charge.

If hardness stays high after two cycles, look past salt entirely. The injector screen, the brine line, and the valve timing are the next three checks, and a technician can run all of them in one visit for $100-$200.

## Preventing the next one

Fill to three-quarters, never to the top. Break the crust at every refill. Clean the tank once a year. Use pellets.

Keep the lid closed and the room ventilated. Humidity is the raw material for both bridges and mush.

Test hardness monthly for three months after any salt event. A number that stays soft confirms the fix.

## When to call someone

Call if the tank needs emptying and you cannot lift it, if the valve body is leaking, or if the brine draw still fails after the screen and line are clear.

Call if salt use stays high after reprogramming. That points to a valve that is regenerating when it should not, which is a controller or meter problem.

Call if the resin is escaping into the plumbing. That is a distributor failure and a rebed, at $300-$600.

[Salt bridge in softener](https://watertreatmentpro.com/salt-bridge-in-softener/) covers the bridge diagnosis in detail, [clean brine tank](https://watertreatmentpro.com/clean-brine-tank/) walks the annual cleaning step by step, and [softener not using salt](https://watertreatmentpro.com/softener-not-using-salt/) covers the case where consumption stops entirely.
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