How to Clean a Water Softener Brine Tank
To clean a water softener brine tank, put the softener in bypass, scoop or drain out the old salt and brine, scrub the tank and brine well with clean water, then put back a few inches of water and fresh salt. Most homes only need to do it when the tank shows mush, a crust or dirty sludge at the bottom, and Hellenbrand's manual says to inspect the salt keeper at least once a year.
What the brine tank does (and why it gets dirty)
The brine tank is the short, wide tank that holds the salt. The tall, skinny one next to it is the resin tank, where the softening happens. During regeneration the control valve pulls salty water out of the brine tank, washes it through the resin, and sends it down the drain.
Inside the brine tank you'll usually find a brine well, which is a plastic tube standing up in one corner. It holds the float valve (sometimes called the safety brine valve) and keeps salt away from the brine pickup. Some tanks also have a grid plate, a perforated shelf that lifts the salt off the floor.
Dirt gets in two ways. Insoluble material in the salt settles on the bottom as sludge. And salt can go soft and pasty at the bottom, which Diamond Crystal calls salt mush, or form a hard crust above the water, which is a salt bridge. Both stop the softener from making good brine. Diamond Crystal says routine cleaning usually isn't needed with high-purity salt.
Signs it's time to clean it
- The water feels hard again even though there's plenty of salt in the tank.
- The salt level hasn't dropped in weeks.
- You find a crust you can tap on, or a layer of mush when you push a broom handle down.
- There's brown or gray sludge on the bottom, or the water in the tank looks dirty.
- The tank holds a lot more water than usual. Morton says 2 to 5 inches of water at the bottom is typical.
If a crust is the only problem, you may not need a full clean. Our page on a water softener salt bridge shows how to break one up without draining anything.
Tools and supplies
- A bucket and a scoop or old plastic container
- A wet/dry shop vacuum (makes draining much faster)
- A stiff brush or rag and a garden hose
- Mild dish soap
- Unscented household bleach, if you plan to sanitize
- New softener salt
- Gloves and safety glasses
Step-by-step: clean the brine tank
Let the salt run low first if you can. Cleaning a nearly empty tank is far less work than digging out a full one.
Put the softener in bypass and unplug it. On most units the bypass is a push-pull or a lever valve on the back of the control head.
Disconnect the brine line from the brine well. This is the small tube that runs from the control valve to the brine tank, and it usually has a compression nut you can turn by hand.
Scoop out the old salt and mush into a bucket. Hellenbrand's manual says not to reuse old salt unless it is clean and not mushy.
Drain or vacuum out the remaining brine. If the tank is light enough, you can tip it over a floor drain or carry it outside once it's empty.
Lift out the brine well and grid plate, if your tank has them.
Scrub the tank, brine well and grid plate with clean water and a brush or rag. A little dish soap helps with greasy sludge. Rinse well so no soap stays behind.
Sanitize if the tank smelled or you saw slime. A mild bleach solution, a short soak, then a thorough rinse is the usual approach. Check your owner's manual first, since some makers sell their own cleanser.
Put everything back and replace a cracked grid plate rather than reusing it.
Add water. Hellenbrand says to add 6 inches of water, or about 1 inch above the grid plate if your tank has one.
Add new salt, reconnect the brine line, plug the softener back in and return the bypass to service.
Start a manual regeneration so the resin gets a fresh brine wash. On the Whirlpool WHES48, holding RECHARGE starts one right away and the manual recharge takes about two hours.
Whirlpool also tells owners of that model to run a softener cleanser through a recharge every four months. That cleans the resin and valve more than the tank.
The float valve, brine line and injector
These three parts cause most "the tank won't drain" and "the tank is overflowing" problems, so look at them while everything is apart.
The float valve rises with the water and shuts off the refill if the level gets too high. Check that it moves freely and that salt crystals haven't jammed it. On most tanks you don't adjust the water level by bending the float. The control valve sets the refill amount, and the float is a backup.
The brine line should be clear and free of kinks. Hold it up to a light or blow through it. A pinched or crusted brine line stops the brine draw.
The injector (also called the venturi) sits in the control head, not the tank. It creates the suction that pulls brine out. Hellenbrand lists a plugged injector as a cause of both excess water in the brine tank and a failure to draw brine. Whirlpool's manual walks through removing the nozzle and venturi, washing the parts in warm soapy water, and checking that the brine level drops after the next recharge. If your brine tank is still full after cleaning, see brine tank full of water.
Mistakes to avoid
- Pounding on the outside of the tank to break a crust. Whirlpool's manual warns against it and against sharp tools that can puncture the tank.
- Filling the tank to the brim with salt right after cleaning. Packing it tight is how bridges start.
- Leaving soap or bleach residue in the tank. Rinse until you can't smell it.
- Forgetting the bypass. Water stays hard until you switch it back to service.
- Dumping the old salt on the lawn. Salt kills grass.
When it's a pro job
Call a plumber or water treatment tech if the tank is cracked, if water still won't drain after you've cleaned the injector and brine line, or if the control head shows an error code. HomeGuide's 2026 guide puts a service call at $40 to $100 before parts. A replacement softener tank runs $150 to $500 before installation, per the same guide. Most cracked tanks can be swapped without replacing the whole softener.
Iron or a smell that comes back fast usually points past the tank to the resin. See water softener resin cleaning and replacement.
FAQ
How often should I clean a water softener brine tank?
Hellenbrand says to inspect it at least once a year for insoluble buildup and to clean it periodically no matter what salt you use. With high-purity salt, Diamond Crystal says routine cleaning usually isn't needed. Clean it when you see mush, a crust or sludge, not on a fixed calendar.
How much water should be in the brine tank?
Morton says 2 to 5 inches of water at the bottom of the salt tank is typical. Some softeners refill only just before regeneration, so a dry-looking tank isn't always a problem. A tank that's half full of water usually means a stuck float or a plugged injector.
What is the brine well in a water softener?
It's the plastic tube in the corner of the brine tank. It houses the float valve and the brine pickup, and it keeps salt from packing around them. You can lift it out to clean it.
How do I drain a water softener brine tank?
Bypass and unplug the softener, disconnect the brine line, scoop out the salt, and then vacuum or bail out the water. A wet/dry vacuum is the fastest way. On a light tank you can also carry it to a floor drain once the salt is out.
How much does a new brine tank cost?
HomeGuide lists a replacement softener tank at $150 to $500 before installation. Check that the new tank fits your softener's brine line and float before you buy.
Sources
- HellenbrandH100 Water Conditioner Owner's Manual (opens in a new tab)
- WhirlpoolWHES48 Water Softener Owner's Manual (opens in a new tab)
- Morton SaltMorton Water Softeners FAQ (opens in a new tab)
- Diamond Crystal (Cargill)Water Softener Salt FAQs (opens in a new tab)
- HomeGuideWater Softener Repair Cost (opens in a new tab)
- Minnesota Department of HealthHome Water Softening (opens in a new tab)