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Softener vs salt-free conditioner vs doing nothing

They do different jobs. A softener removes hardness. A conditioner leaves it in the water and tries to stop it from forming scale.

	Ion-exchange softener	Salt-free conditioner	Nothing
What it does	Removes calcium and magnesium (cation exchange)	Per EPA, “instead of removing the hardness ions, they condition them” to reduce scale	Leaves the water as is
Uses salt / regenerates	Yes	No (per EPA, no added chemicals or water waste)	No
Certification to look for	NSF/ANSI 44	IAPMO/ANSI Z601 (Scale Reduction Devices)	None
Sensible when	Hard to very hard water (EPA: often recommended over 180 mg/L / 10 gpg)	You want less scale but softeners aren't appropriate, for example for medical reasons or local bans (EPA's examples)	Soft or moderately hard water (under about 120 mg/L)

Buying a softener: what EPA suggests

Size it. Softeners are rated in grain capacity, the grains of hardness removed per cycle. Your hardness and household water use set the size, and EPA warns that oversizing wastes water and salt.
Efficiency. Look for 5 gallons of water or less per 1,000 grains removed and a salt efficiency above 3,350 grains per pound of salt. The voluntary NSF/ANSI 44 efficiency rating verifies both.
Regeneration. EPA's guide favors demand-initiated regeneration (DIR) over timer-based systems for efficiency.
Installation. Install it before the water heater, and if you can, after the branch to outdoor hose bibbs and irrigation. Use the bypass valve for outdoor water.

Not sure what capacity you need? See what size water softener do I need?

“Salt-free softener” as a label. EPA describes these as conditioners that don't remove hardness ions, so check for Z601 certification rather than the word “softener.”
Quotes that skip a hardness test. Without your number, nobody can size the system.

Last updated: 2026-10-21