Water in the Brine Tank: How Much Is Normal (and How to Fix Too Much)

By Casey Miller · Updated October 2026

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What the brine tank does

The brine tank is the shorter tank that holds the salt (on one-piece cabinet softeners, it’s the cabinet around the resin tank). Water sits in it and dissolves some of the salt into brine. During each regeneration, the control valve draws that brine into the resin tank to recharge the resin, and refills the brine tank with fresh water for next time. For the full cycle, see how a water softener works.

• Brine well: the tube standing inside the salt tank. It keeps salt away from the brine valve and float. Whirlpool calls it the brinewell, the black tube in the salt storage tank.
• Brine valve and float (safety float): lets brine out and water in through the brine line, and shuts off if the water rises too high.
• Air check: stops air being drawn into the brine line once the brine runs out. A. O. Smith says to clean it along with the tank once a year.
• Grid plate: a platform some tanks use to hold the salt above the bottom. Pentair says the refill water must rise above the grid so it touches the salt.
• Brine line: the small tube from the valve to the brine well, 3/8 or ½ inch on Clack valves.
• Overflow: a fitting near the top of the tank. Whirlpool and Rheem say its hose must run downhill to a drain no higher than the fitting, separate from the softener’s drain line.

How much water should be in the brine tank?

It depends on the softener and on when it refills. Most softeners refill the brine tank at the end of a regeneration, so water stands in the tank until the next one, dissolving salt. Some refill at the start instead: Whirlpool’s softeners refill the salt tank first, then draw brine. People sometimes call these wet and dry brine tanks.

From GE’s “Normal Water Level” page, A. O. Smith’s AO-WH-SOFT owner’s manual, Pentair’s 5600SXT downflow manual and SXT control manual, Clack’s WS1 spec sheet and service manual, and Whirlpool’s WHES48 manual.

On a two-tank softener the amount of water tracks the salt dose. Quality Water for Less’s Fleck setup table pairs each minute of brine fill with 1.5 lb of salt. At a refill rate of 0.5 gallons per minute, which many of Pentair’s 5600SXT models and Clack’s WS1 use, that works out to roughly a gallon of water for every 3 lb of salt per regeneration, so a 15 lb salt setting means about 5 gallons of refill. If you change the salt dose in your settings, expect the water level to change too.

Whatever the design, keep the salt above the water. Pentair says to maintain the salt level above the water level, and A. O. Smith says to add salt when it drops below the water.

How it works: the checker compares your depth with GE’s 2–5 inches and A. O. Smith’s 2–12 inches, and checks the signs the makers list for too much water, low salt, salt bridges and a tank that isn’t refilling. For two-tank softeners it estimates the refill at about 1 gallon per 3 lb of salt.

Why is my brine tank full of water?

A tank that keeps filling means water goes in at each refill but the brine isn’t being drawn out. These are the causes the makers list:

From GE’s “Brine Tank Not Draining” page and the troubleshooting tables in Whirlpool’s, A. O. Smith’s, Pentair’s and Clack’s manuals.

How to fix too much water

1. Check the drain hose. Follow it from the softener to the drain, straighten kinks and clear blockages. Make sure it isn’t raised higher than your manual allows and isn’t joined to the overflow hose.
2. Clean the nozzle and venturi. Put the softener in bypass and follow your manual. On Whirlpool cabinets you unscrew the cap, lift out the screen and disc, wash the parts in warm soapy water and reassemble them with the gasket holes lined up.
3. Check the brine valve and float. Lift the float out of the brine well and clean off any salt or sludge. If it sticks or is cracked, replace it.
4. Test the water pressure. Whirlpool says low pressure may disrupt brine draw; it wants at least 20 psi.
5. Run a manual regeneration and watch. Whirlpool’s manual-advance check has you watch water enter the tank during fill, then confirm the level drops during the brine step. If it doesn’t drop, the injector or drain is still blocked.

If the water is also salty, the same faults are usually to blame; see why softened water tastes salty.

Hard water but plenty of salt? Check for a salt bridge

Whirlpool says a salt bridge is a hard crust that leaves an empty space between the water and the salt, so no brine forms and the water turns hard. It lists a bridge as a cause when the water is hard and the salt level isn’t dropping. GE warns the tank can look half full of salt when it’s really a fused layer with salt water and empty space underneath.

1. Test it. Mark a broom handle at the height of the tank’s rim and push it gently down into the salt. If it stops on something hard before the mark reaches the rim, it’s probably a bridge (Whirlpool). GE says a bridge is there if the mark ends up 4 inches above the tank.
2. Break it gently. Push the handle into the crust in several places. Whirlpool says not to use sharp or pointed objects, and GE says not to bang on the sides of the tank, which can crack it.
3. Dissolve a stubborn one. GE suggests pouring in a gallon of warm (not hot) water.
4. Prevent it. Whirlpool blames humidity and the wrong salt. It recommends pellet, nugget or coarse solar salt with less than 1% impurities, not rock salt, and keeping the salt level lower in humid areas.

How to clean a water softener brine tank

A. O. Smith says to inspect and clean the brine cabinet and air check once a year, or whenever there’s sediment in the tank. Dirt and insoluble residue from the salt settle at the bottom; Whirlpool steers owners away from rock salt because it’s high in impurities.

1. Let the salt run low. Plan the cleaning for when the tank is nearly empty, so there’s less to scoop out.
2. Bypass and unplug. Put the softener in bypass and unplug it.
3. Empty the tank. Scoop out the remaining salt and any crust, then remove the water and sludge with a cup or a wet/dry vacuum. Lift out the grid plate if there is one.
4. Wash it. Scrub the inside of the tank and the brine well with mild soap and water, rinse well, and clean the air check and float.
5. Put the water back. Refill the starting water as your manual describes. Pentair’s start-up has you add about 1 inch of water above the grid plate. A. O. Smith fills its tank at start-up by advancing the valve to its Brine Refill step and says not to add water at any other time, so use that same step after cleaning.
6. Sanitize if your manual says to. Whirlpool has you pour about 3 oz of household bleach into the brinewell and run a regeneration, then run a cold tap. A. O. Smith uses 4 fl oz of bleach in the brine well, with water in the tank, and then a manual regeneration.
7. Add salt and wait. A. O. Smith says that if the salt was below the water level before you added it, wait two hours for the brine to form before starting a regeneration.

Resin cleaners are a different job: they go into the brine well to clean the resin, not the tank. See the best water softener cleaners.

Where should the brine tank go?

Next to the softener, on a clean, level surface; Pentair says to make sure the floor beneath the salt tank is clean and the tank is level. The overflow hose has to run downhill to a drain point no higher than the overflow fitting (Whirlpool and Rheem), and the area must not freeze; Whirlpool says to drain the softener if it could freeze. Our installation guide covers drains and air gaps.

Replacing a brine tank or its parts

Whirlpool says a leaking salt tank usually means a crack in it, and the fix is a new salt storage tank assembly. On cabinet softeners, order it from the maker for your model. For two-tank softeners, separate brine tanks are sold by size; Quality Water for Less’s Fleck table lists 11 × 11, 15 × 17, 18 × 33, 18 × 40, 24 × 41 and 24 × 50-inch tanks. Bulky tanks are mostly sold by water treatment parts stores; Amazon is better for the parts inside them.

Frequently asked questions

Should there be water in my water softener brine tank?

Yes, on most softeners. GE says it’s normal to have some water in the brine tank, about 2 to 5 inches on its models. Check your own manual for your model’s level.

How often should I add salt?

GE says to check the salt weekly once the softener is settled in, and to refill it when the tank is ¼ to ½ full. Whirlpool says to add salt whenever it’s less than ¼ full. Never let it run out.

How often should I clean the brine tank?

A. O. Smith says once a year, or sooner if you see sediment.

Can I add water to the brine tank by hand?

Only when your manual says to, usually at start-up or after cleaning. Pentair’s start-up adds about an inch of water above the grid plate. A. O. Smith fills the tank through the valve’s Brine Refill step and says not to add water at any other time.

What is a brine well?

The upright tube inside the salt tank that houses the brine valve and float and keeps salt away from them. With potassium chloride, Whirlpool says to check the tank and brine well monthly for hardened salt.

Related guides

• Water softener regeneration
• Why softened water tastes salty
• Best water softener cleaners
• Best water softeners

Sources

• GE Appliances support: Normal Water Level, Brine Tank Not Draining and Checking Salt Storage Level / Adding Salt.
• A. O. Smith, AO-WH-SOFT-350C/400T/450T owner’s manual: water level, salt, cleaning, sanitizing, drain line and troubleshooting.
• Whirlpool, WHES48 installation and operation manual (7392327 rev. D, 2023), and Rheem, RHS18 manual: overflow, salt, salt bridges, sanitizing and troubleshooting.
• Pentair, Fleck 5600SXT downflow service manual (42684) and SXT control manual (42713); 56SXT softener meter product page (brine line flow controls).
• Clack Corporation, WS1 spec sheet and WS1 and WS1.25 drawings and service manual.
• QualityWaterForLess.com, Fleck 5600SXT installation guide: salt, brine fill and grid table.
• Amazon listings for the float and grid plate, checked October 2026.