Water equipment
Best Water Softeners
A softener targets hardness — the dissolved calcium and magnesium that cause scale buildup, cloudy glassware, and reduced soap lather. It's a different job from a carbon or RO filter, and often used alongside one.
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Quick picks
We are still verifying product picks for water softening, and we only list products after an editor has checked them. Until then, here is how to build a shortlist that fits your home.
- Know your hardness. Test hardness in grains per gallon. It determines whether you need a softener at all and how large.
- Capacity and household size. Choose a grain capacity that matches your hardness and daily water use so it doesn't regenerate constantly.
- Salt-based vs salt-free. Salt-based softeners remove hardness minerals. Salt-free conditioners reduce scale but leave the minerals in the water.
- Salt and water use. Check regeneration efficiency: how much salt and water each cycle uses.
Full comparison
Our product comparison for water softening fills in as products are reviewed. These are the criteria we compare on, so you can check any model against them yourself.
| What to compare | What to look for |
|---|---|
| Know your hardness | Test hardness in grains per gallon. It determines whether you need a softener at all and how large. |
| Capacity and household size | Choose a grain capacity that matches your hardness and daily water use so it doesn't regenerate constantly. |
| Salt-based vs salt-free | Salt-based softeners remove hardness minerals. Salt-free conditioners reduce scale but leave the minerals in the water. |
| Salt and water use | Check regeneration efficiency: how much salt and water each cycle uses. |
| Installation | Needs a drain, power and space for the resin and brine tanks; professional installation is common. |
Salt-based ion exchange vs. salt-free conditioners
Traditional softeners use ion-exchange resin that swaps calcium and magnesium ions for sodium (or potassium) ions, regenerating periodically with a brine solution — this is the only method that actually removes hardness minerals from the water.
Salt-free "conditioners" use a different mechanism (commonly template-assisted crystallization) that alters mineral structure so it's less likely to form scale, without actually removing the minerals or adding sodium — a relevant distinction for anyone on a sodium-restricted diet.
Sizing by grain capacity
Softeners are rated by grain capacity — roughly how many grains of hardness they can remove between regenerations. The right size depends on your household's water hardness level (in grains per gallon) and daily water usage; an undersized unit regenerates constantly and wears out faster, while an oversized one wastes salt and water per cycle.
Frequently asked questions
Does a water softener make water safe to drink?
Softening addresses hardness minerals specifically — it isn't a substitute for filtration aimed at chlorine, contaminants, or pathogens. Many households run a softener and a separate drinking-water filter for different jobs.
Is softened water bad for you?
For most healthy adults, the added sodium from ion-exchange softening is small compared to typical dietary sodium intake, but people on strictly sodium-restricted diets sometimes choose potassium chloride instead of salt, or a salt-free conditioner, or keep one unsoftened tap for drinking.
How do I know if I need a softener?
Signs include mineral scale on faucets and showerheads, spotty dishes, and soap that doesn't lather well. A local water hardness test (in grains per gallon) is the reliable way to confirm before buying.
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