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Hard-water spots are back, your soap will not lather, but the brine tank is full of salt, so what gives? A softener that is not regenerating has stopped running its cleaning cycle, the resin never gets recharged, and you are basically running hard water through a dead filter. The good news is that the usual causes are simple and DIY: a salt bridge, a salt mush, a stuck setting, or a gummed-up brine valve. Here is how I track it down. If you are seeing the classic hard-water signs again, this is where to start.
How a Softener Regenerates (60-Second Version)
The resin tank is full of beads that grab hardness minerals. Periodically the control valve runs a regeneration cycle: it draws salty water (brine) from the salt tank, flushes the minerals off the resin, and rinses to drain. If salt never gets used, the brine tank stays full, that full tank is the symptom people misread as fine, when it actually means regeneration is not happening.
The Usual Causes, Easiest First
| Symptom | Likely cause | Fix |
|---|---|---|
| Salt level never drops | Salt bridge (hard crust) over empty space | Break the bridge with a broom handle |
| Mushy pile at the tank bottom | Salt mush / brine sludge | Scoop it out, clean the tank |
| Clock blinking / wrong time | Power loss reset the control head | Reset time and regeneration schedule |
| Salt fine but no soft water | Stuck brine valve / clogged injector | Clean the valve and injector screen |
| Constant water running to drain | Control valve stuck in regen | Clean or rebuild the valve |
Fix 1: Break the Salt Bridge
The most common cause by far. Humidity makes the salt crust into a hard dome that looks full but has an air gap underneath, so the water below never touches salt and cannot make brine. Tap the tank, if it sounds hollow, push a broom handle down to break the crust. Refill with a quality pellet salt — Morton Clean and Protect water softener pellets are the standard 40-pound bag — and do not overfill (keep it under half to two-thirds) to stop bridges from reforming. Not sure which bag to buy? Our guide to the best water softener salt compares pellets, solar crystals and potassium chloride.
Fix 2: Clear Salt Mush and Clean the Brine Tank
At the other extreme, salt can recrystallize into a mushy sludge on the tank floor that blocks the brine draw. Scoop it out, dump the old water, and wash the tank. While it is empty, check the brine line and the float assembly for gunk.
Fix 3: Reset the Control and Force a Regen
A power outage often resets the control head to a blinking clock, and if the time is wrong it never triggers the overnight regen. Reset the time of day and the regeneration schedule per your manual, then force a manual regeneration (usually hold the regen button a few seconds) and watch: you should hear it draw brine and send water to drain. If it runs a full cycle, you have confirmed the valve works and it was just a scheduling issue.
Fix 4: Clean the Brine Valve and Injector
If salt is fine and a forced regen does not draw brine, the brine valve or the injector (a small nozzle/venturi that creates suction) is clogged with sediment or salt. Shut off and bypass the softener, then remove and rinse the injector screen and brine valve. A clogged injector is the most common reason a mechanically sound softener will not pull brine. Compare a repair against a replacement in our best water softener and installation cost guides.
When to Call a Pro
Salt bridges, resets, and a basic injector clean are DIY. Call a plumber or the manufacturer if the control valve is stuck cycling or leaking internally (a valve rebuild), if the resin is exhausted after 10 to 15 years (resin replacement or a new unit), or if you have hard water and other quality issues that suggest the whole system needs a look. If a unit is old and failing repeatedly, replacement often beats chasing parts.
Frequently Asked Questions
Why is my water softener not using salt?
The most common reason is a salt bridge, a hard crust of salt that forms a dome with an empty gap underneath, so the water never reaches the salt to make brine and the level appears stuck. Tap the tank; if it sounds hollow, break the crust with a broom handle. Other causes are a salt mush blocking the brine draw, a control head reset by a power outage so it never runs its cycle, or a clogged injector that cannot pull brine.
How do I fix a salt bridge in my water softener?
Carefully push a broom handle or similar blunt tool straight down into the salt to break the hardened crust, working around the tank until the loose salt below collapses. Avoid sharp tools that could puncture the tank. Afterward, keep the salt level no more than half to two-thirds full and use a good-quality pellet or solar salt, overfilling and humidity are what cause bridges to form in the first place.
How do I force my water softener to regenerate?
Most units have a manual regeneration option, typically you press and hold the regen or recharge button for a few seconds until the control head starts the cycle. Watch and listen: it should draw brine from the salt tank and send water to the drain. If it runs a full cycle and you get soft water afterward, the problem was just scheduling (often a clock reset by a power outage). If it will not draw brine, the injector or brine valve is likely clogged.
If your softener keeps giving you trouble, it’s worth stepping back: do you actually need one for your water? and what hard water really costs if you skip treatment.
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