Standing Water in Your Softener's Brine Tank on Daniel Island: Normal or a Problem?

Lift the lid on a water softener's salt tank in a lot of Daniel Island and Mount Pleasant garages and you'll find water sitting in the bottom. Some homeowners see that and assume something's broken. Others never look, and don't notice when the tank slowly fills up until salt mush is floating near the top.

I'm Christian with Avery & Sons Plumbing + Tankless. Here's how to tell normal water in a brine tank from a problem, and what you can check yourself before you call anybody.

Some water in there is normal

A softener cleans its resin by pulling salty water, called brine, out of the salt tank. To have brine ready, most softeners keep a few inches to around a foot of water in the bottom of the tank all the time, covered by salt. That's called a wet brine tank, and it's how a lot of the units we see in East Cooper are set up.

Other softeners use a dry tank. They only add water a few hours before a regeneration, so most of the time you won't see much water at all. Your owner's manual or the label on the control valve will tell you which kind you have.

Either way, a rule of thumb: if the water stays below the top of the salt and the level is about the same week to week, you're fine.

When it's a problem

• The water keeps rising. If the level is climbing toward the top of the tank, or water is sitting well above the salt, the softener is adding water during regeneration but not drawing it back out.

• The water is fresh, not salty. If there's plenty of salt but the water still tastes plain, or the salt hasn't gone down in weeks, the brine isn't getting made or used. You'll usually notice hard water spots coming back around the same time.

• There's a layer of mush on the bottom. Wet, pasty salt at the bottom can block the brine well and the pickup screen. Cheap rock salt with lots of residue makes this worse. Our post on which softener salt to use covers why.

What you can check yourself

• Look at the drain line. The small tube running from the softener to the drain or laundry box carries the rinse water away. If it's kinked, crushed behind a shelf, or the end is stuck down in standing water, the softener can't push water out and the brine tank backs up.

• Make sure the power stayed on. If the power blinked in the middle of a regeneration, the valve can stop mid-cycle and leave extra water in the tank. Our post on resetting the softener clock after an outage walks through that.

• Break up any salt crust. A hard bridge of salt can leave a gap above the water, so the water sits there plain instead of turning into brine. Here's how to spot salt bridging.

• Start a manual regeneration and watch. Most valves have a button or menu option to regenerate now. During the brine draw step, the water level in the tank should drop. If it doesn't move, the problem is usually inside the valve.

When to call a plumber

If the drain line is clear, the power's fine, and the water level still won't drop during a regeneration, the usual culprits are a clogged injector (a tiny nozzle inside the valve that creates the suction), a dirty screen, or a stuck brine float. Those are quick fixes for someone who knows the valve, but it's easy to lose small parts if you've never had one apart.

And if your softener is old enough that this is the third or fourth problem this year, it may be time to look at the resin and the valve as a whole. Our post on how long a water softener lasts has the warning signs.

Easy next step

Avery & Sons Plumbing + Tankless services softeners and filters on Daniel Island, in Mount Pleasant, and across East Cooper. Call (843) 305-5555 or visit averysplumbing.com.

A little water under the salt is normal. A tank that keeps filling up is not. Check the drain line first, and don't let it sit until you've got a garage floor full of salt water, neighbors.