A water softener doesn’t need much attention, but it does need some. EPA’s WaterSense program says installing and maintaining a softener according to the manufacturer’s instructions “will prevent damage and unnecessary water and salt use” (U.S. EPA WaterSense). Here are the jobs that matter most, especially if your softener treats well water with iron.
How often to add salt to a water softener
EPA’s guide says to fill the brine tank about half full with salt pellets and check the salt level every 4 to 6 weeks. Once the salt falls below the water level, add more, and don’t let it drop below one quarter full (U.S. EPA WaterSense). The University of Minnesota Water Resources Center gives a similar rule of thumb: check salt levels monthly (University of Minnesota Water Resources Center).
How fast your softener uses salt depends on the number of people in the household, daily water use, softener capacity and water hardness (University of Nebraska-Lincoln Extension). If the tank runs out, EPA notes that your water won’t soften and the unit will waste water and energy (U.S. EPA WaterSense).
What salt to use in a water softener
Nebraska Extension says softeners are designed for specific types of salt, so follow your manufacturer’s recommendation (University of Nebraska-Lincoln Extension). What the sources say:
| Salt type | What the source says |
|---|---|
| Pellets (compressed, evaporated salt) | “The majority of softeners are designed for this type of salt.” Iron-control pellets may contain food-grade additives such as citric acid (University of Nebraska-Lincoln Extension). |
| Solar salt | Comes from evaporated seawater and may sometimes leave a pink film or stain in sinks and tubs, according to the City of Woodbury, Minnesota (City of Woodbury, MN). |
| Rock salt | May carry impurities that reduce regeneration and plug valves; use only if the manufacturer suggests it (University of Nebraska-Lincoln Extension). EPA says to avoid rock salt, road salt and table salt (U.S. EPA WaterSense). |
| Salt blocks | Only for units designed for blocks; livestock blocks may contain additives that don’t work in a softener (University of Nebraska-Lincoln Extension). |
| Potassium chloride | Can replace sodium chloride (Minnesota Department of Health). It is 15 to 30% less efficient, so you’ll add it more often (University of Minnesota Water Resources Center). |
The Minnesota Department of Health says anyone with a history of high blood pressure should consult a doctor about drinking softened water (Minnesota Department of Health).
Salt bridges and mushing
A salt bridge is a hard layer that forms in the middle of the brine tank. EPA explains that it keeps pellets from falling to the bottom and stops the salt from mixing with the water below to make brine (U.S. EPA WaterSense). The usual clue is a salt level that doesn’t go down over time (U.S. EPA WaterSense).
To break one, EPA says to use a broom handle or similar item, then start a regeneration cycle. Push straight down gently in a few spots, and work around the brine well (the tube inside the tank) rather than prying against it. To prevent bridges, don’t fill the tank to the top: EPA notes that the extra weight can cause bridging (U.S. EPA WaterSense).
If salt hardens over the openings in the brine well, EPA says to pour a gallon of hot tap water into the tank, wait about 10 minutes, break it up, then regenerate (U.S. EPA WaterSense).
Wet sludge at the bottom instead of loose salt (often called mushing) calls for a brine tank cleaning. EPA says to clean the tank as needed, at least every few years: let the salt run down, empty it, wash with warm soapy water, sanitize with a bleach solution and rinse (U.S. EPA WaterSense). How often depends on the amount and purity of your salt (NDSU Extension). Nebraska Extension says to clean and inspect the brine valve and float at least once a year (University of Nebraska-Lincoln Extension).
Iron in well water and your softener’s resin
USGS estimated that 103,189 of Horry County’s 309,199 residents were self-supplied for household water in 2015, meaning not served by a public water system (USGS ScienceBase). In a USGS study of the shallow surficial aquifer in parts of South Carolina, Georgia and Florida, iron was at high levels compared with EPA’s secondary (aesthetic) standard in about 50 percent of the study area (USGS Fact Sheet 2022-3035). That study sampled public-supply wells, not Horry County homes, so your own test is what counts. See our guide to iron in well water.
Penn State Extension explains that colorless, dissolved iron can be removed by a softener, but “red-oxidized iron (iron that has been exposed to air or chlorine) will clog the resin” (Penn State Extension). The Minnesota Department of Health calls this fouling and says filtering the water before the softener may be needed to prevent it (Minnesota Department of Health).
Capacity varies. Nebraska Extension says softeners may remove as much as 5-10 ppm of iron and manganese, so check the manufacturer’s rating; iron above it may require pretreatment such as an iron filter (University of Nebraska-Lincoln Extension).
Fouled resin can be treated with commercial cleaners used according to the manufacturer’s instructions (Minnesota Department of Health). EPA says resin beads should be cleaned annually, usually by pouring the manufacturer’s recommended cleaner into the brine well and running a regeneration (U.S. EPA WaterSense). The University of Minnesota suggests every 3-12 months depending on iron levels (University of Minnesota Water Resources Center).
Sediment and carbon pre-filters
Clemson Extension says whole-house sediment filters remove particles and “reduce the maintenance needs of other treatment systems that follow” (Clemson Cooperative Extension HGIC 1903). Cloudy water can clog softener resin with mud and clay, and a sediment filter ahead of the softener could help (Minnesota Department of Health).
Whether it’s a sediment cartridge or a carbon cartridge, EPA says filters should be replaced according to the manufacturer’s instructions and recommended schedule, and warns that unmaintained systems may make water quality worse (U.S. EPA WaterSense).
Signs your water softener isn’t working
Hard water leaves spots on glassware, films on shower doors and tubs, and dingy laundry (University of Nebraska-Lincoln Extension), and it makes soap harder to lather (U.S. EPA WaterSense). If those come back, look for white spots on dishes and the other hard water symptoms, then check the basics: is there salt above the water line, is there a bridge, and is the bypass valve in the service position?
A hardness test settles it. Test kits and dip strips are available, though lab testing is more reliable, and Nebraska Extension recommends re-testing periodically after any treatment is installed (University of Nebraska-Lincoln Extension). EPA says water above 120 mg/L (7 gpg) is generally considered hard (U.S. EPA WaterSense).
Bypass valve, power outages and storms
Every softener has a bypass valve that sends water around the unit (U.S. EPA WaterSense). EPA suggests using it for outdoor water that doesn’t need softening and returning it to its previous position afterward (U.S. EPA WaterSense). It also keeps water flowing to the house during a repair.
After a power outage, EPA says to check that the softener is still programmed correctly and to reset the clock (U.S. EPA WaterSense). Controls vary, so check your owner’s manual. After a hurricane, a flooded well needs to be disinfected and tested, and SC Department of Public Health says not to use the water until it has been tested (SC Department of Public Health). Keep the softener in bypass until then and ask your installer before putting it back in service. See our well water testing guide.
Water softeners and septic systems
Each regeneration sends water to the drain. EPA says a typical softener uses 20 to 70 gallons per cycle, and some larger systems use up to 200 gallons (U.S. EPA WaterSense). Penn State estimates about 50 gallons, which “may or may not cause hydraulic overload of the septic system” (Penn State Extension). If you’re on septic, EPA suggests checking with the septic system manufacturer or a local service provider (U.S. EPA WaterSense). Minnesota’s Water Resources Center says newer research finds efficient softeners don’t harm septic tanks, while timer-based units or units that aren’t set correctly may (University of Minnesota Water Resources Center).
When to call for service
Nebraska Extension says to have a service provider check the settings if the softener seems to use more salt than expected or the water isn’t softened (University of Nebraska-Lincoln Extension). EPA says a constant trickle of water to the drain could mean a broken valve (U.S. EPA WaterSense). Resin that can’t be cleaned may need to be replaced (Penn State Extension), and a water treatment professional can advise on cleaning or replacing it (University of Nebraska-Lincoln Extension). See our water softener service or softener installation guide.
Start with a free in-home water test
Clemson Extension recommends a full well test that includes hardness, iron and manganese (Clemson Cooperative Extension HGIC 1902). Our free in-home water test is a screening at your tap, not a lab test. For bacteria, nitrate, lead or arsenic, a certified laboratory test is the way to confirm. If you’re in Horry County, see our Horry County water testing page.
Sources
- U.S. EPA WaterSense: Soften Water Without Wasting It, Guide to Selecting and Maintaining a Water-Efficient Water Softener (May 2026)
- U.S. EPA WaterSense: Guide to Selecting Water Treatment Systems (November 2024)
- University of Nebraska-Lincoln Extension: Drinking Water Treatment: Water Softening (Ion Exchange), G1491 (revised September 2014)
- Penn State Extension: Water Softening (updated September 8, 2025)
- NDSU Extension: Water Softening (Ion Exchange), WQ1031 (revised May 2022)
- University of Minnesota Water Resources Center: Residential softening
- Minnesota Department of Health: Home Water Softening, Frequently Asked Questions (updated 10/03/2022)
- City of Woodbury, MN: Are there different types of salts I can use in my softener? (FAQ)
- Clemson Cooperative Extension HGIC 1902: Residential Drinking Water Wells: Water Quality (Oct 31, 2023)
- Clemson Cooperative Extension HGIC 1903: Residential Drinking Water Well: Water Treatment Options (Oct 31, 2023)
- USGS Fact Sheet 2022-3035: Groundwater Quality in the Surficial Aquifer System, Southeastern United States (July 22, 2022)
- USGS ScienceBase: Estimated Use of Water in the United States, County-Level Data for 2015 (file usco2015v2.0.csv)
- SC Department of Public Health: Water & Food Safety (storm and hurricane preparedness)
Frequently asked questions
How often should I add salt to my water softener?
EPA WaterSense suggests checking the salt every 4 to 6 weeks, keeping the tank about half full, and adding salt once it falls below the water level. The University of Minnesota suggests a monthly check. How fast you use salt depends on your household, water use and hardness.
What is a salt bridge in a water softener?
It is a hard layer of salt in the brine tank that keeps salt from reaching the water below, so the softener cannot make brine. EPA says to break it up gently with a broom handle, then run a regeneration.
What salt should I use in my water softener?
Use the type your manufacturer recommends. Most softeners are designed for pellets, according to Nebraska Extension. EPA advises using pellets made for softeners and avoiding rock salt, road salt and table salt.
Does iron in well water hurt a water softener?
It can. Penn State Extension says oxidized iron will clog the resin. A resin cleaner, used according to the manufacturer, helps, and water with more iron than the softener is rated for may need an iron filter first, per Nebraska Extension.
Why is my water softener not working?
Common causes include an empty salt tank, a salt bridge, a valve left in bypass, or a clock that was not reset after a power outage. If those check out, a hardness test and a service visit are the next steps.
Is a water softener OK with a septic system?
Each regeneration sends water to the drain, typically 20 to 70 gallons per EPA. EPA suggests checking with your septic system manufacturer or a local service provider.