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Potassium Chloride for Water Softeners: Pros and Cons

Using potassium chloride instead of sodium chloride in a softener: what it changes, what it costs and what settings to adjust.

By Softenry Editorial · Updated October 2026

The short answer

Potassium chloride avoids adding sodium to softened water; it costs more and makers often call for a higher salt setting.

Pros and cons

Potassium chloride vs sodium chloride
Potassium chlorideSodium chloride
Adds sodium to waterNoAbout 8 mg/L per gpg removed
CostHigherLower
SettingOften higherStandard

Switching

  • Let the tank run low on salt first.
  • Raise the salt setting if the maker says to.
  • Test the water afterwards to confirm it's still soft.

Options

Morton F114980000G 40 lb Potassium Chloride Softener Pellets, Compass Minerals 38240 40 lb Potassium Chloride Softener Pellets.

Products mentioned

Potassium chloride · Morton

Morton F114980000G 40 lb Potassium Chloride Softener Pellets

Potassium chloride pellets · 40 lb

Morton
Potassium chloride · Compass Minerals

Compass Minerals 38240 40 lb Potassium Chloride Softener Pellets

Potassium chloride pellets · 40 lb

Compass Minerals

Questions readers ask

Is potassium chloride better for water softeners?
It avoids added sodium; it costs more and may need a higher setting.
Can I mix salt and potassium chloride?
Many owners switch over gradually; check your maker's guidance.