Water Softener Settings for Hardness and Salt

By SubcontractorHub Editorial Team·Published November 2026

A control valve will accept almost any number. The number that belongs there is the water you measured, not a sticker from a different house. This guide is the order of operations. It is not a brand menu.

Water Softener Settings Start With the Test

Hardness is what the valve uses to decide how soon the bed is exhausted. If you type a low number, the softener waits too long and hard water gets through. If you type a high number, it regenerates early and uses more salt than the test required. Either miss is a setting error, not a resin mystery.

How to get the number, with a strip or a lab, is how to test water hardness. This page does not repeat the test. It starts when you have a result in hand. A hardness level on a lab slip and a hardness setting on a valve are the same quantity only after you convert the units.

Labs often print milligrams per liter or parts per million as calcium carbonate. The valve wants grains per gallon. Use the water hardness converter for that step. Do not retype a parts-per-million figure into a grains field. Water softener settings that skip the conversion are off by the factor the converter already applies.

Iron Is Not a Second Hardness Guess

Dissolved iron uses some of the same resin capacity that calcium and magnesium use. Many manuals tell the installer to compensate. The amount is the manual's amount. A search for one universal "add this many grains per milligram of iron" rule was not pinned to a fetched manufacturer page or an extension page for this article, so the rule is not printed.

If the manual you are holding names a compensation, follow that manual and write the model number next to the setting. If it does not, leave the hardness number as the test, and say so on the ticket. Inventing an add-on makes the next tech argue with a number nobody sourced.

Iron high enough that a softener should not be the first tank is a different article. Well water, stains, and a filter ahead of the resin are not a hardness setting. Water softener settings cannot correct a prefilter that was never installed.

What to Enter, and What to Leave on a Calculator

Grain capacity of the tank you installed, people in the house, and daily use belong on the water softener sizing calculator. This guide does not rebuild that math. It only says the hardness you type into the valve should be the hardness you typed into the sizer. Two different numbers means one of them was a guess.

Regeneration Time and How Often

A clock setting is when the softener is allowed to run a cycle. Households usually want that while nobody is showering. The manual for the valve is the place that names the button. This page will not name a brand's menu, and it will not declare a clock time as if it were a code.

How many days between cycles is capacity divided by the grains the house uses. That division is the water softener regeneration calculator. Metered valves regenerate when the meter says the gallons are gone. Time-clock valves regenerate on the days you picked, whether or not the bed is exhausted. Water softener settings should say which of those two the valve actually is. A metered valve with a hardness number that is wrong will still miss, because the meter trusts the hardness you entered.

If treated water tests hard between cycles, the setting or the resin is the question, not a new clock. The symptom list is the water softener troubleshooting guide. Do not raise the hardness setting to hide a salt bridge or a failed seal.

Salt Dose Is an Efficiency Trade

More salt per regeneration returns more capacity and uses more salt. Less salt is more efficient per pound and returns less capacity, so the valve regenerates sooner. That trade is real. The pounds are not a number this article owns. Type the dose you intend on the salt dose calculator and keep the valve's salt setting matched to it.

A high-efficiency claim without the manual's pounds is advertising. Water softener settings that say "efficient" and do not say the dose are unfinished. Write the pounds the installer programmed, from the manual, on the ticket.

Salt type, including whether the tank is filled with sodium chloride or something else, is not this page. The ongoing check that the setting is still right is water softener maintenance. A setting from the install day is stale if the source water changed and nobody retested.

What to Write on the Ticket

1. The test date, the method, and the hardness as printed, plus the grains per gallon after conversion.
2. Iron, and whether a compensation from that model's manual was applied. If none was fetched or printed, write "none applied."
3. Metered or time-clock, and the regeneration time that was programmed.
4. The salt dose in the units the valve uses, matched to the salt calculator inputs.
5. The capacity and people count that were used on the sizing calculator, so the setting and the size tell one story.
6. No brand menu path copied from memory. If the manual was not on the truck, say the manual was not on the truck.

Dealers who program water softener settings in the field still need the test on the same account as the equipment. The number is useless if the next visit cannot see it. A note in a personal phone is not a job file.

Nothing on this page is a promise that a particular efficiency percentage will show up on a water bill. The only numbered inputs are the ones the customer's test and the manufacturer's sheet already had. If those sheets are missing, the honest water softener settings are "not programmed from a source," and the return visit is the test.

Frequently Asked Questions