Water softener not working
A water softener swaps the hard minerals in your water for sodium (or potassium) using a tank of resin beads, and it recharges those beads with salty brine from the salt tank. When the water turns hard again, spots return on dishes or the salt level never goes down, the problem is usually simple: the softener is bypassed, its clock is wrong after a power outage, or the salt has formed a hard crust called a salt bridge so no brine can form. Those take minutes to fix. A worn-out resin bed or a failed control valve needs a pro.
How a water softener works
Hard water carries dissolved calcium and magnesium. In a softener, water flows through a tall tank full of tiny resin beads that hold sodium (or potassium) ions. As water passes over them, the beads grab the hardness minerals and release sodium in their place, so the water coming out is soft. Over days, the beads fill up with minerals and stop working. That's when the softener regenerates: the control head on top of the resin tank draws salty brine from the salt tank, rinses it through the beads to knock the minerals off, and flushes them down the drain. It usually does this at night, on a timer or after a set amount of water use.
For that to work, the softener needs power and the right time and settings, the bypass valve has to send water through it, and the salt tank has to make brine. Salt only becomes brine where it touches water at the bottom of the tank. In humid basements or with low-quality salt, the salt can form a hard crust, a salt bridge, with a hollow space under it. The tank looks full, but no salt reaches the water, so regenerations use plain water and the beads never recharge. Salt can also turn to mush at the bottom and clog the brine draw. Resin beads last many years but do wear out eventually.
Why a softener stops softening
Water goes around the softener, often after plumbing work.
After an outage it regenerates at the wrong time or not at all.
A crust over a hollow; the tank looks full but makes no brine.
Sludge at the bottom blocks the brine draw.
Hardness or schedule set too low for your water.
Old beads or a failed control valve. Pro repair.
| You notice | Likely cause | Start at |
|---|---|---|
| Not sure the water is hard | Test it first | Step 1 |
| Hard water after plumbing work or an outage | Bypass, power or clock | Step 2 |
| Salt level never goes down | Salt bridge | Step 3 |
| Water or mush in the salt tank | Brine draw blocked | Step 4 |
| Salt is used but water stays hard | Regeneration or settings | Step 5 |
| Still hard after all that | Resin or valve | Step 6 |
Let's fix it
- Test the waterBuy water hardness test strips at a hardware store or pool supply, often included with the softener. Run cold water at a kitchen tap for a minute, dip a strip as the package says and compare the color. Soft water reads near zero grains per gallon. If the result is well above zero, the softener isn't doing its job. Also test a tap that bypasses the softener, often an outdoor spigot or the kitchen cold if it was plumbed that way, to know your raw water hardness; you'll need that number for Step 5. Signs of hard water are spots on dishes, soap that doesn't lather well and scale on faucets.
- Check the bypass, power and clockFind the bypass valve where the pipes connect to the softener's control head. It may be a single push-button or knob, or a set of three valves. Set it to Service (sometimes marked In or Softening), not Bypass; the label or arrow on the valve shows which is which. Make sure the softener is plugged in and the display is on. If the power went out, many softeners lose the time of day and then regenerate in the middle of the day or not at all. Set the clock as the manual shows. Also check that the outlet works, and that it isn't on a switch that someone turned off.
- Look for a salt bridgeLift the salt tank lid. If the tank looks full but the salt hasn't gone down in weeks, you likely have a salt bridge. Take a broom handle or a similar long, blunt pole and push it gently straight down into the salt in several places. If it hits a hard crust and then breaks through into empty space, that's the bridge. Tap the crust around the edges to break it into pieces, working away from the brine well (the tube inside the tank). Don't use a sharp tool or hammer the sides, which can crack the tank. Let the broken salt drop into the water at the bottom.
- Clear salt mush or standing brineLook at the bottom of the salt tank. A thick layer of wet, pasty salt sludge, salt mush, can block the brine well's intake. If the salt level is low, scoop out the mush with a cup or small bucket. Dissolve it in water and pour it down a utility sink or floor drain, or toss it outdoors away from plants and lawns. Some water standing in the tank, usually a few inches, is normal on many models; the manual says how much. If the tank is full of water or keeps filling, the brine line or float valve may be stuck, a repair to check in the manual or with a technician. Before opening anything, unplug the unit and close the bypass so no water flows through it. Refill with clean softener salt pellets or crystals to about half to two-thirds full, not packed to the top.
- Run a manual regeneration and check settingsStart a manual regeneration as your manual shows, usually by pressing and holding a Regen or Recharge button for a few seconds. It typically takes one to two hours, and you'll hear water running to the drain; avoid using water during that time, since most softeners send unsoftened water to the house while they regenerate. Over the next few days, the salt level should start to drop. Then check the settings: the hardness setting should match your raw water hardness from Step 1, in grains per gallon. Some meters read in milligrams per liter, which you divide by about 17.1 to convert. Add extra for iron if you have it, as the manual explains. Too low a setting means it doesn't regenerate often enough. Test the water again a day after regeneration.
- Know when it's the resin or valveIf the bypass is right, the clock and settings are correct, the softener uses salt and regenerates, and the water is still hard, the problem is likely inside. Resin beads typically last many years, often 10 to 20, but chlorine in city water and iron in well water shorten that. Signs of worn or damaged resin include soft water that doesn't last between regenerations, or small beads showing up in faucet aerators, which can mean a broken distributor tube. A failed control valve, piston or seals can also stop proper regeneration. These are jobs for a water treatment technician, who can also test your water for iron and other problems.
Watch it done
- A test strip reads near zero at the kitchen tap
- The salt level drops slowly over a few weeks
- No spots on dishes and soap lathers well
- The clock shows the right time
Still hard after regenerating? A water treatment tech can check the resin and valve.
If it comes back
If salt bridges keep forming, keep the tank only half to two-thirds full, use higher-purity pellets, and break up the surface every month or two, especially in a humid basement.
If water pressure drops across the house after the softener was added, see the guide for low water pressure in the whole house. A bypass test can tell you whether the softener is the restriction.
If the hot water smells like rotten eggs, softened water can speed up the reaction in a water heater. See the guide for hot water that smells like rotten eggs.
What a pro typically charges (a rough estimate; prices vary by area): A service call typically runs about $100–$200. Replacing resin usually costs about $200–$500, and a new softener installed often runs about $1,000–$3,000.
Find a water softener technician near you