Guide · hard water

Water Softener Systems

Two different goals get sold under one word. One reduces hardness minerals; the other reduces the scale they leave. Which you need, and what size, depends on your water and your household, not on a grain number on a box.

One reduces hardness minerals; the other reduces the scale they leave. Which you need depends on your water, not a grain number.

Size it to your water See the picks

Softening vs conditioningTwo goals · one word

What it does

Reducing hardness, or reducing scale.

A softener swaps calcium and magnesium for sodium on a resin bed, then flushes them to drain with brine. A conditioner leaves the minerals in the water and changes how they crystallize so less scale sticks. Only the first makes water soft; the second needs no salt or drain.

Who it suitsHomes with hard water, scale on fixtures, dull laundry
What it needsA drain, salt refills, and room for two tanks
What it won’t doReduce lead, chlorine or anything but hardness and some iron
Size byHardness × people × iron, never the grain number alone

WaterDecoder’s picks · from systems in our database that qualify for this job · not a ranking

Our picks

Not curated yet

Our editors haven’t curated ion-exchange softener picks yet.

There are no picks for this set yet. Every system in our database is in the catalogue below, and Finder can match one to your home.

Ask Finder

Sizer

Size it to your water, not to a grain number on a box.

Three facts about your home set the capacity you need. The Sizer says “unknown” when it can’t size from what you entered, labels every estimate with its assumptions, and never turns a guess into a product.

Water Softener SizingNothing is stored unless you ask

What’s your water hardness?

From a test strip, a lab report, or your utility’s water quality report.

1Hardness × people2A daily load, with assumptions shown3Capacity and regeneration in Water Softener Sizing, or “unknown”Open Water Softener Sizing

Says “unknown” rather than guessing
Every estimate names its assumptions
Finder asks its own questions for now: nothing carries over from the Sizer yet

The catalogue

All home water softeners

No published products

No published products in this category yet.

We don’t have any systems in our database yet. When one is added with its evidence on file, it appears here with its basis and the facts that decide a purchase.

Scale on fixtures only? Salt-free conditioning →Iron or sulfur? Treatment products →Drinking water taste? Water filters →

Finder

Not sure what you need?

Finder asks how you know, what a test found and what your home needs, then tells you plainly what it can match.

Ask Finder

Before you buy

Four numbers size a softener before the brand does.

Hardness: Yoursto measure; Scale and soap use climb as hardness rises. Test strips are cheap; your utility report is free.
Capacity @ dose: At a dosenot a box size; Capacity is only meaningful at a salt dose. A tank’s nominal grain size is not what it delivers at an efficient setting, so read the capacity the maker publishes for each dose.
Per regeneration: Per usesalt and water; What you carry home every month. Metered valves regenerate on use, which reduces salt and water use compared with timers.
Household · general guide: Yourhousehold; Household size is one of the facts that sizes a softener, not a sizing on its own. Your number comes from the Sizer, from your hardness and household, or stays “unknown”.

Also decidesIron and manganeseA softener handles small amounts; more than that needs dedicated treatment first, or the resin fouls. Check the maker’s stated limit.Drain and salt accessRegeneration needs a drain within reach and somewhere dry for 40 lb bags.Sodium in the waterSoftened water carries sodium; a bypass for the kitchen tap or an RO under the sink is common.ConditionersNo salt, no drain, nothing taken out of the water. Fine for scale on fixtures, not for soft water.