Guide · Home care
Water Softener Salt
A plain, friendly guide to keeping a water softener working: adding salt, the salt type and fill level, spotting a salt bridge, and what to report.
Where to start
- Water feels hard, but the tank looks full?
It may be a salt bridge. See when the tank looks full.
- Time to add salt?
Check adding salt for the type and fill level, and lift those heavy bags safely.
- New to a home with a softener?
Ask who adds salt and who handles repairs, then tick through the checklist.
The short version
In many parts of the country, the water coming into the home carries a lot of minerals. That is called hard water, and it leaves spots on dishes, crust on faucets and a dull film in the shower.
A water softener takes care of that, and it runs on salt. Most of the time it just needs a bag added now and then. Once in a while, the salt plays a little trick and stops working even though the tank looks full.
This guide explains how to keep it simple and what to report. We are always glad to help if something seems off.
How a softener works
A softener has two parts: a tall tank that does the softening, and a wider tank that holds salt and water, called the brine tank. Every so often, the softener rinses itself with salty water from the brine tank so it can keep softening.
Who does what
Please check the lease or ask the owner. In many homes, the owner asks residents to add salt, while the owner handles settings, repairs and cleaning out the brine tank. These are examples.
Residents can often
- Adding salt, when the owner asks
- Checking the salt about once a month
- Gently checking for a salt bridge, if the owner is okay with it
- Reporting hard water, leaks and error lights
Leave to the owner or a pro
- Settings and repairs
- Cleaning out the brine tank
- Starting a regeneration, unless the owner has shown you how
Adding salt
- Check the salt about once a month.
- Use the type of salt the maker recommends. Many makers suggest pellet or crystal salt made for softeners and advise against rock salt, which can leave more dirt behind.
- Fill to the level the maker suggests. Many makers say to keep the tank at least a third to half full, and not to overfill it.
- Put the lid back on, and keep children and pets away from the open tank.
Salt bags are heavy, often around 40 pounds. Lift with your legs, keep the bag close to your body, and ask for help or buy smaller bags if that is easier. Pour slowly so the salt does not splash or spill.
When the tank looks full but the water feels hard
Sometimes the salt fuses into a hard crust with empty space under it. This is called a salt bridge. The tank looks full, but the softener cannot make the salty water it needs. Signs include:
- The water feels hard again, with spots on dishes or less lather from soap.
- The salt level has not gone down in weeks.
If the owner is okay with it, you can check gently:
- Push the blunt end of a clean broom handle straight down into the salt.
- If it stops on a hard layer a few inches down, tap gently to break the crust into chunks.
- Never use anything sharp or metal, like a screwdriver or a hammer, and never force the salt down hard, since that can damage the parts inside the tank.
If the crust does not break easily, or the water stays hard after a day or two, please stop and tell the owner. A mushy layer at the bottom of the tank may need a full cleanout, and that is an owner or pro job.
Signs to report
Here are some common examples. This is not a complete list.
- Hard water that comes back and stays.
- Water standing high in the brine tank.
- Leaks or puddles around the softener.
- Error codes or flashing lights on the control.
- Salty tasting water from the faucets.
Water softener checklist
From the guide’s own checklist. Tick each one as you go. Your ticks stay on this device. These are examples; your home may need others.
All done. A little salt and a quick monthly look keep soft water flowing.
An everyday example
A resident noticed spots on the drinking glasses even though the softener looked full of salt. Their tape mark showed the salt had not moved in five weeks. With the owner’s okay, they pushed a broom handle into the salt and hit a hard crust a few inches down. A few gentle taps broke it apart, and the chunks dropped into the water below. They let the owner know, and the owner started a regeneration that evening. By the weekend, the glasses were coming out of the dishwasher clear again.
Guides that go well with this one
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Go deeper with The Perfect Plumbing
A softener is one part of a home’s water system. The Perfect Plumbing walks through the whole system, from shutoff valves to water heaters, with clear notes on who does what.
Keep this guide handy
Save this page, come back to your checklist any time, and share it with anyone in your home who could use it.
See all guidesTake it with you
- Bunklow Home Guide 110: Water Softener Salt Bridge Breaking and Brine Tank CleaningA printable Bunklow guide to water softener salt bridge breaking and brine tank cleaning: plain steps, how often to check, and when to call a pro.See it in the shop
- Plumbing and Water Checklist PackThe Plumbing and Water checklists in one pack, fillable on screen or printable.See it in the shop
This guide shares general educational information to help you, and is not legal advice or a substitute for a licensed professional. Bunklow does not inspect, repair or service plumbing or water systems. Rules differ from state to state and town to town, and some areas limit softeners that discharge salt water, so please check your state and local rules and your lease, follow the maker’s instructions, and get local help from a qualified professional for repairs.