Fix
Water Softener Using Too Much Salt
A water softener using too much salt is usually set for harder water than you have, regenerating on a short timer, counting leaked water, or putting too much water in the brine tank. Each is quick to check.
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Quick answer
- Retest raw water and enter the real hardness in gpg.
- Aim for a regeneration about once a week at an efficient salt setting.
- Look for running toilets and drips; metered valves count every gallon.
- Too much water in the brine tank makes stronger, bigger brine doses.
What normal salt use looks like
Quality Water Treatment's upkeep page describes refilling roughly every one to three months, usually two 40-lb bags per refill. If you are filling the tank far more often than that with no change in household size or water use, something is off.
Salt per regeneration depends on the salt setting and the size of the resin bed. Pentair's 5600SXT manual gives these ratings:
| Resin bed | Salt used each regeneration | Grains removed (rated) |
|---|---|---|
| One cubic foot | 9 lb | 31,100 |
| One and a half cubic feet | 13.5 lb | 46,600 |
| Two cubic feet | 18 lb | 62,200 |
Those are maximum-capacity figures. At its lowest salt setting Pentair rates the valve at 4,400 grains per pound, and the Water Quality Association describes efficient softeners as running at 3,000 to 4,000 grains per pound. Lower salt settings remove less hardness per regeneration but waste far less salt, which is why a softener sized for the home should regenerate about once a week.
Settings that waste salt
The Fleck 5600SXT service manual lists an improper salt setting as the first cause of too much salt. Quality Water Treatment adds a hardness setting entered wrong. Check these in user mode or the programming menu:
- Hardness (H). Enter raw-water hardness in grains per gallon. If your lab result is in mg/L, SoftPro's Elite guide says divide by 17.1 and round up. A figure set far too high makes the valve think capacity runs out early. Retest with a kit; see how to test water hardness.
- Capacity (C). The Fleck manual says the control works out system capacity as unit capacity divided by hardness, minus the reserve. A capacity entered lower than the real unit shortens every cycle.
- Reserve or safety factor. Pentair allows a safety factor of 0 to 50 percent of capacity. Quality Water Treatment programs 15 percent. A large reserve triggers regeneration with plenty of capacity left.
- Day override (DO). This forces a regeneration after a set number of days even if capacity remains. Quality Water Treatment sets 14. A short DO on a light-use home wastes salt.
- Control type. A timer valve regenerates by days, not by water used. If yours is set to time clock and your water use has dropped, it regenerates more often than needed.
The settings guide and Fleck 5600SXT programming guide show each screen. For target intervals, see how often a softener should regenerate.
Leaks and constant regeneration
A metered valve counts every gallon that passes it, including water lost to a running toilet or a dripping faucet. The Water Quality Association's septic guidance lists fixing leaking toilets alongside keeping the softener at its efficient setting.
To check, turn off every tap and appliance. On a Fleck 5600SXT, the flow indicator flashes when water is flowing; if it keeps flashing with the house quiet, water is leaking somewhere downstream. The diagnostic screen (hold Up and Extra Cycle for 5 seconds) also shows flow rate and volume used.
If the valve seems to regenerate constantly, SoftPro says that points to a control valve or settings issue. A drain that runs nonstop, per the Fleck manual, comes from a valve not positioning correctly, debris in the control, or an internal leak. Quality Water Treatment also lists damaged resin and low water pressure among causes of heavy salt use. For leaks at the softener itself, see water softener leaking.
Brine refill problems
The Fleck manual's second cause of too much salt is excess water in the brine tank. More water dissolves more salt, so each regeneration draws a bigger dose than the setting intends.
- Brine fill time. On a Fleck SXT the BF time sets how much water returns to the tank. QWT sets 12 minutes on a 32,000-grain unit, and larger systems need a different figure. A BF time set too long overfills.
- Brine valve or float. QWT names a clogged brine valve and an overflowing tank among the culprits. A float that sticks lets extra water in.
- Poor brine draw. If the injector is partly clogged, leftover water stays in the tank and adds up. See brine tank full of water.
- Bridges or mush. Quality Water Treatment includes bridges and mushy salt in its list; break and clean as needed.
If none of these explain it, the main troubleshooting guide works through the valve and resin.
Common questions
Does a bigger household always mean more salt?
Yes, roughly. Daily grains to remove equal people times about 75 gallons a day times hardness, so more people means more regenerations at the same setting. Update the settings if household size has changed.
Will turning the salt setting down make my water hard?
Not if the softener is sized with headroom. A lower salt dose removes fewer grains per regeneration, so the valve regenerates a little more often, but each cycle uses salt more efficiently. Retest softened water after any change.
Can iron in my water raise salt use?
Yes. Iron uses up resin capacity, so install guides raise the hardness setting for it, which shortens the time between regenerations. SoftPro's Elite guide adds 3 gpg for iron of 2 to 3 ppm; follow your softener's manual.
Does potassium chloride use more than salt?
Yes. NDSU Extension says about 10% more potassium chloride is used per regeneration, so expect bags to go down faster than with sodium chloride.
Related guides
More help: see our water softener maintenance and repair guides.