Five salt-based water softeners for city water, two certified to NSF/ANSI 44, compared by grain capacity, certification and price, with a sizing chart.
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Our Choice for Best Water Softener
SpringWell SS
- 32,000, 48,000 or 80,000 grains
- Lifetime limited warranty (5 years on the electronic head)
The short answer: For city water, our top pick is the SpringWell SS (~$1,607). It earns the spot for its size range (32,000 to 80,000 grains) and lifetime limited warranty (5 years on the head), but it is not NSF/ANSI 44 certified. If you want a softener certified to NSF/ANSI 44, choose the Aquasana SimplySoft (~$849). For a certified budget pick, choose the Rheem Preferred (~$489). Size it with the chart below. On a private well, use our well water softener guide instead.
Before you buy: A water softener is a tank of resin beads that swaps hardness minerals, calcium and magnesium, for sodium or potassium. Hardness is measured in grains per gallon (gpg). USGS calls water above 180 mg/L, about 10.5 gpg, very hard (USGS). City water users can often find hardness in their utility's annual water quality report (EPA). Not every report lists it, so you may need to test it at home.
| Softener | Best for | NSF/ANSI 44 certified | Grains | Price | Check price |
|---|---|---|---|---|---|
| SpringWell SS | Best overall | No | 32K, 48K, 80K | ~$1,607 | SpringWell |
| Aquasana SimplySoft | Best certified | Yes (IAPMO) | 40K, 60K | ~$849 | Aquasana |
| SoftPro Elite | Upflow design, city water | No | 32K to 64K | ~$1,367 | SoftPro |
| Rheem Preferred | Budget certified pick | Yes (NSF) | 33K | ~$489 | Home Depot |
| Fleck 5600SXT 48K | DIY budget build | No | 48K | ~$791 | Amazon |
Prices were checked on October 5, 2026, on each maker's site, at Home Depot (Rheem) and on Amazon (Fleck), and change often. Prices are for the smallest size in each row.
Which Water Softeners Are Certified?
NSF/ANSI 44 is the standard for home water softeners. It checks hardness reduction, material safety, structural strength and the stated capacity (NSF). An "efficiency rated" listing also means the unit removes at least 3,350 grains per pound of salt. These certifiers listed residential softeners to NSF/ANSI 44 on October 5, 2026. It is not a full list, so check the listing for your model:
- NSF: Rheem Preferred, Whirlpool, WaterBoss, GE, Morton and others (NSF listing)
- IAPMO: Aquasana SimplySoft 40K and 60K (IAPMO listing)
- WQA: Pentair's own Fleck 5600 SXT configurations, Culligan and Hague models
SpringWell, SoftPro and DROP had no NSF/ANSI 44 listing at NSF, IAPMO or WQA that day. That does not mean they fail to soften water. It means none of these certifiers has tested their capacity and efficiency claims against NSF/ANSI 44.
How We Chose These Softeners
Our methodology rests on evidence anyone can check:
- Certification. We searched NSF, IAPMO and WQA for every pick and say plainly whether each one is listed.
- Specs from the maker. Capacity, flow and warranty come from each maker's own pages, and prices from the maker or the retailer named under the table. Maker claims are labeled as such.
- Fit for city water. This guide covers salt-based softeners for city water. Salt-free systems and well water have their own guides, linked below.
These are research-based picks. We did not test them ourselves. We fact-checked every certification, price and link on this page on October 5, 2026. If you spot an error, please contact us. To learn who we are, read more about us.
What Size Water Softener Do You Need?
Grain capacity is how much hardness a softener removes before it has to regenerate. To size one, multiply people by daily use, hardness and days between regenerations. Penn State uses about 75 gallons per person per day as an example (Penn State Extension).
Grains a softener removes in a week, using Penn State's sizing method. Your own use and hardness will differ.
For example, 4 people on 10 gpg water need about 21,000 grains a week. A 32,000-grain softener would regenerate about every 10 to 11 days. At 20 gpg, the same family needs about 42,000 grains a week, so a 48,000-grain unit fits better. Flow matters too: more bathrooms need more gallons per minute. SpringWell rates its 32K model for 1 to 3 bathrooms.
The 5 Best Water Softeners
1. SpringWell SS: Best Overall
The SpringWell SS is a salt-based ion exchange softener sold direct by SpringWell. Its control head is set up through SpringWell's phone app and uses what SpringWell calls "smart regeneration." It comes in three sizes:
- SS1: 32,000 grains, 11 GPM, 1 to 3 bathrooms, ~$1,607
- SS4: 48,000 grains, 13 GPM, 4 to 6 bathrooms, ~$1,785
- SS+: 80,000 grains, 20 GPM, 7 or more bathrooms, ~$2,678
SpringWell gives a lifetime limited warranty on tanks and valves and 5 years on the electronic head. It offers a 6-month money-back guarantee on unused systems (SpringWell). It holds no NSF/ANSI 44 listing.
Pros: sizes up to 80,000 grains; long warranty; app setup.
Cons: no sediment pre-filter included; not certified; its manual says not to install it on well water without calling SpringWell first.
Is it for you? Choose it for a city-water home that wants a large, long-warranty softener from a direct seller.
2. Aquasana SimplySoft: Best Certified Softener
The Aquasana SimplySoft is a salt-based softener with a separate brine tank and a sediment pre-filter. IAPMO certifies the 40K and 60K models to NSF/ANSI 44 for hardness reduction, with an efficiency rating (IAPMO listing). IAPMO also certifies it to CSA B483.1 (CSA listing).
- Price: ~$849 for 40,000 grains; ~$1,149 for 60,000
- Flow: about 11 GPM rated
- Maintenance: Aquasana says to replace the sediment pre-filter every 2 months
- Warranty: 5- and 10-year limited, plus a 90-day satisfaction guarantee
Pros: certified capacity and efficiency; pre-filter included; lower price than the SpringWell.
Cons: frequent pre-filter changes; shorter warranty than SpringWell or SoftPro.
Is it for you? Choose it if you want a softener whose capacity and salt efficiency a certifier has tested.
3. SoftPro Elite: Best Upflow Softener for City Water
The SoftPro Elite Smart HE is SoftPro's city-water model. It uses an upflow design and 10% crosslink resin that SoftPro rates for up to 20 years. SoftPro says its precision brining saves up to 30% more salt (SoftPro).
- Price: ~$1,367 (32K) to ~$1,587 (64K), in four sizes
- Flow: 11 to 20 GPM peak, by size
- Iron: SoftPro rates it for up to 2.0 ppm
- Warranty: lifetime on tanks and valve, plus a 6-month money-back guarantee
SoftPro shows an "NSF / WQA / ANSI Certified" badge, but NSF, IAPMO and WQA had no matching softener listing on October 5, 2026.
Pros: upflow design that SoftPro says saves salt; vacation mode and auto reserve; an optional Wi-Fi salt sensor ($89).
Cons: not certified; for city water only, since SoftPro sells a separate well model.
Is it for you? Choose it if you are on city water and want an upflow softener with SoftPro's salt-saving claim, knowing NSF, IAPMO and WQA have not certified it.
4. Rheem Preferred: Best Budget Certified Softener
The Rheem Preferred (model RHS32) is an all-in-one cabinet softener sold only at Home Depot. NSF certifies it to NSF/ANSI 44 for hardness, with an efficiency rating, plus barium and radium reduction (NSF listing). Rheem sells it as a 32,000-grain model and rates it at 33,000 grains, 7.9 GPM and up to 105 gpg hardness.
- Price: ~$489 at Home Depot; the 42,000-grain RHS42 is ~$589
- Salt: Rheem says it uses up to 40% less salt, from its own lab tests (Rheem)
- Warranty: 1 year parts and labor (extendable to 5), 3 years on electronics, 10 years on the tank
Pros: the lowest price of the five picks; certified; compact cabinet.
Cons: a short base warranty; lower flow suits smaller homes.
Is it for you? Choose it for a smaller home on a budget that still wants a certified unit. The WaterBoss 900 (~$570 at Ace) is another NSF/ANSI 44 option.
5. Fleck 5600SXT 48K: Best DIY Budget Build
The Fleck 5600SXT is a metered control valve made by Pentair that many dealers build into complete softeners. Our link is AFWFilters' 48,000-grain build on Amazon, about $791. Pentair's own 5600 SXT configurations are WQA-certified to NSF/ANSI 44, but dealer builds like this one are not listed themselves.
Pros: a widely used valve; metered regeneration; cheaper than the SpringWell and SoftPro.
Cons: support comes from the dealer, not Pentair; you need plumbing skills to install it.
Is it for you? Choose it if you are comfortable with DIY plumbing and want a standard valve.
SpringWell SS vs SoftPro Elite
Shoppers often compare these two direct-sold softeners, and neither holds an NSF/ANSI 44 listing. The main differences are size range, salt use, controls and price.
- Size: SpringWell goes up to 80,000 grains; SoftPro's largest is 64,000.
- Salt: SoftPro claims up to 30% salt savings from precision brining. SpringWell publishes no salt-use figure.
- Controls: SpringWell sets up through a phone app. SoftPro uses an onboard head, with an optional Wi-Fi salt sensor.
- Price: SoftPro starts at about $1,367 and SpringWell at about $1,607.
Choose the SpringWell for larger homes. Choose the SoftPro for a lower starting price and its upflow design. If tested salt efficiency matters most, pick a certified unit such as the Rheem Preferred or Aquasana SimplySoft.
Want Scale Control Without Salt?
A salt-free conditioner does not soften water. It changes how minerals form scale, using template-assisted crystallization. SpringWell says its FutureSoft prevents up to 95% of scale buildup (SpringWell FutureSoft). It costs about $1,785 and needs water with no iron. Compare options in our best salt-free water softeners guide.
On a Private Well?
Well water can carry iron, manganese or sediment, and oxidized iron clogs a softener's resin. Penn State says softeners are generally recommended for iron only when dissolved iron is under 5 mg/L, pH is above 6.7 and hardness is 3 to 20 gpg (Penn State Extension). SpringWell's well system pairs an iron filter with a softener, for about $3,124 plus a required water test (SpringWell well system). See our best water softeners for well water guide.
Also Considered
- DROP Smart Water Softener: app control and leak shut-off, from about $3,441 plus a required $443 DROP Hub. Not certified.
- Whirlpool WHES40: certified to NSF/ANSI 44, but Home Depot, Lowe's and Amazon did not have it for sale on October 5, 2026.
- AQUASURE Harmony 48K: about $630, but not certified (Amazon).
- On The Go Portable: an 8,000-grain softener for RVs that connects to a garden hose, about $165. Not certified.
Salt, Water and Running Costs
Salt is the main running cost. For 4 people on 10 gpg water, salt use works out to roughly 18 to 40 pounds a month, depending on the salt setting. An efficiency-rated unit removes at least 3,350 grains per pound of salt. Each regeneration also uses water, around 50 gallons by Penn State's estimate. Rheem says its softener uses less than $5 a year in electricity.
Soft water also saves soap. A research summary from the Water Quality Research Foundation reports that softened water can cut laundry detergent use by 50% (WQRF). USGS notes that hard water leaves mineral buildup in plumbing and water heaters.
Frequently Asked Questions
What is the best water softener for a home?
For most city-water homes, the SpringWell SS. If you want certified performance, the Aquasana SimplySoft or the Rheem Preferred. Size it to your hardness and household first.
How big a water softener do I need for a 3-bathroom house?
Bathrooms set the flow you need; people and hardness set the grains. SpringWell rates its 11 GPM model for up to 3 bathrooms. Then use the chart above: 4 people at 10 gpg need about 21,000 grains a week, so a 32,000-grain unit works.
Is it bad to buy too big a water softener?
Not usually. An oversized unit regenerates less often, so some makers force a regeneration after a set number of days; SpringWell's manual sets a 14-day override. Salt efficiency is driven by the salt setting. Rheem rates the RHS32 at 4,940 grains per pound at its minimum salt dose (2.6 lb). Its 33,000-grain rating uses 14.1 lb of salt, which works out to about 2,340 grains per pound.
How long does a 40 lb bag of salt last in a water softener?
For 4 people on 10 gpg water, about one to two months, depending on the salt setting. SoftPro says a 40-pound bag lasts 2 to 4 months on its city model. Harder water and more people shorten that.
How much does it cost to install a water softener?
If you do it yourself, mostly parts and a few hours. SoftPro estimates two to three hours for a DIY install. A plumber's price depends on your local rates and how much pipe work is needed.
Do I need a softener or a salt-free conditioner?
A softener removes hardness, so you get the soft-water feel and less soap use. A salt-free conditioner only reduces scale. See our salt-free guide to compare.
Key Takeaways
- Best overall: SpringWell SS (~$1,607), 32,000 to 80,000 grains, lifetime limited warranty (5 years on the head).
- Best certified: Aquasana SimplySoft (~$849), IAPMO-certified to NSF/ANSI 44.
- Best budget certified: Rheem Preferred (~$489), NSF-certified.
- Size by people, hardness and days between regenerations, then check flow for your bathrooms.
- On a well, test for iron first and use our well-water guide.
Need more help? See how to remove iron from well water and our guide to the best whole house water filters.
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