SpringWell vs SoftPro for well water: softeners and iron filters compared

SpringWell and SoftPro both sell a salt softener and an air-injection iron filter for wells, and the right brand depends on your test. Get SpringWell if you have moderate iron plus a sulfur smell (its WS filter lists 7 ppm of iron and 8 ppm of hydrogen sulfide) or you need very high flow. Get SoftPro if your iron is high (its Iron Master lists 30 ppm) and your well pump can meet the filter’s backwash minimum of 5 to 10 gpm.

This comparison uses only what each brand publishes on its product pages. We haven’t installed either system. When we checked in September 2026, seven of the top nine search results for this question came from SoftPro’s own sites, so we checked those claims against the product pages they describe.

Which one to get, SpringWell or SoftPro

• Get the SpringWell WS iron filter if your iron is under 7 ppm, manganese under 1 ppm, and you smell sulfur. It’s the only one of the two filters with a hydrogen sulfide number.
• Get the SoftPro Iron Master if your iron is between 7 and 30 ppm or your manganese is above 1 ppm, and you’ve measured your well’s flow.
• Get the SpringWell SS softener for 7 or more bathrooms (the SS+ is rated at 20 gpm) or slightly acidic water down to pH 6.5.
• Get the SoftPro Elite softener if you want upflow brining with metered regeneration and your iron is under 3 ppm, or already filtered.

	SpringWell SS salt-based softener	SoftPro Elite Smart HE (well-water version)	SpringWell WS well water filter	SoftPro Iron Master AIO
Best for	Homes with many bathrooms that need high flow	Well owners who want an upflow metered system with sturdier resin	Wells with moderate iron plus a sulfur smell	High-iron wells whose pump can meet the backwash minimum
Sizes	SS1 32k (9x48 tank), SS4 48k (10x54), SS+ 80k (13x54)	32,000, 40,000, 48,000 and 64,000 grains	WS1 (1 to 4 bathrooms), WS4 (4+ bathrooms)	1.0, 1.5, 2.0 ft³
Flow	11, 13 or 20 gpm by size	Sold by band: 6 to 7, 8 to 10, 11+ gpm	12 or 20 gpm	n/a
Household	1 to 3, 4 to 6, or 7+ bathrooms	n/a	n/a	n/a
pH range	6.5 to 10	n/a	6.5 to 10	n/a
Pressure	25 to 80 psi	n/a	n/a	n/a
Max iron	Not published	Not on the product page (3 ppm per SoftPro's comparison page)	7 ppm	30 ppm
Source	SpringWell product page	SoftPro product page	SpringWell product page; WS1/WS4 installation manual	SoftPro product page
Resin	n/a	10% crosslink	n/a	n/a
Regeneration	n/a	Upflow, metered demand	n/a	n/a
Max hardness	n/a	Not published	n/a	n/a
Max manganese	n/a	n/a	1 ppm	7 ppm
Max hydrogen sulfide	n/a	n/a	8 ppm	n/a
Method	n/a	n/a	Air injection, greensand fusion media, single tank	n/a
Backwash flow	n/a	n/a	5 gpm (WS1) or 7 gpm (WS4), per installation manual	n/a
Min well flow	n/a	n/a	n/a	5, 7 or 10 gpm by size
Hydrogen sulfide	n/a	n/a	n/a	Claimed, no limit published
Media	n/a	n/a	n/a	Katalox Light
Valve	n/a	n/a	n/a	1 in
	Check price atSpringWell (opens partner site)	Check price atSoftPro (opens SoftPro site)	Check price atSpringWell (opens partner site)	Check price atSoftPro (opens SoftPro site)

SpringWell WS vs SoftPro Iron Master limits

The filters are where these brands differ most. SpringWell’s WS product page lists removal of up to 7 ppm of iron, 1 ppm of manganese and 8 ppm of hydrogen sulfide, with a pH range of 6.5 to 10. SoftPro’s Iron Master page lists up to 30 ppm of iron and 7 ppm of manganese, and says it treats hydrogen sulfide without giving a number.

So the SoftPro has four times the iron headroom and seven times the manganese headroom. The SpringWell has the only published sulfur figure. If your report shows 4 ppm of iron and a strong rotten-egg smell, the WS is the one whose stated limits you can hold the company to.

Both brands claim more than the extension ranges. Penn State Extension lists oxidizing filters for iron plus manganese of 3 to 10 mg/L and oxidation followed by filtration, such as chlorination, above 10. Its hydrogen sulfide guide puts oxidizing filters at up to about 2 to 3 mg/L and recommends continuous chlorination above 6. That doesn’t make either brand’s figure wrong, but if your numbers sit near the top of a filter’s range, plan on a lab retest after installation.

SoftPro’s comparison page also doesn’t match SpringWell’s own figures. It describes the SpringWell system as handling “up to 7 ppm iron and 1 ppm hydrogen sulfide”. SpringWell’s own page says 8 ppm of hydrogen sulfide; 1 ppm is its manganese figure.

Well flow and backwash

An air-injection filter cleans itself by backwashing: it reverses flow to flush trapped iron down the drain. If your pump can’t supply enough water for that, the media stays dirty and iron comes through.

SoftPro publishes this clearly. The Iron Master needs a minimum well flow of 5 gpm for the 1.0 ft³ size, 7 gpm for 1.5 ft³ and 10 gpm for 2.0 ft³, and the page warns buyers to check their pump before ordering. SpringWell says the WS backwashes every night but doesn’t list a minimum well flow on the product page. For the SS softener it gives a backwash rate only for the largest size (4 gpm on the SS+).

To find your number, SoftPro’s Elite page asks you to time how long a 5-gallon bucket takes to fill; 300 divided by the seconds gives gallons per minute. A weak well that gives 4 gpm rules out every Iron Master size, and leaves you asking SpringWell what the WS needs before you order.

Softener design and sizing

The two softeners are sold in different ways, which makes a straight comparison harder than it should be.

SpringWell’s SS spec table sizes by bathrooms: the SS1 (32,000 grains) at 11 gpm for 1 to 3 bathrooms, the SS4 (48,000) at 13 gpm for 4 to 6, and the SS+ (80,000) at 20 gpm for 7 or more. All sizes list pH 6.5 to 10 and 25 to 80 psi.

SoftPro’s Elite page offers 32,000, 40,000, 48,000 and 64,000 grains, with 10% crosslink resin and an upflow valve that regenerates by metered use. Instead of a flow rating per size, it asks which band your well pump falls in (6 to 7, 8 to 10, or 11+ gpm).

Grain numbers on both are nameplate figures, and neither brand publishes capacity at an efficient salt setting. That gap matters: the Whirlpool WHES40E manual, which does publish it, lists 40,000 grains at 15.5 lb of salt but 31,600 at 9.0 lb and 11,900 at 2.4 lb. Size by resin volume with our water softener size calculator and check the salt bill with the running cost calculator.

What neither brand publishes

Both brands leave out numbers a well owner needs:

• SpringWell SS: no maximum iron and no maximum hardness.
• SpringWell WS: no minimum well flow for its nightly backwash.
• SoftPro Elite: no iron limit on the product page (3 ppm appears only on SoftPro’s comparison page) and no maximum hardness or pH range.
• SoftPro Iron Master: no hydrogen sulfide limit and no pH range.
• Both softeners: no capacity at efficient salt settings and no regeneration water figures.

SoftPro’s comparison page also gives the Elite an 80,000-grain capacity and a 15 gpm flow rate. We couldn’t match either to the sizes on the Elite product page, which stop at 64,000 grains and quote flow bands. If a spec matters to your decision, take it from the product page and ask for the rest in writing. The big-box softeners in our roundup of the best water softeners for well water publish far more, because their manuals follow NSF/ANSI 44.

Buying from each

Both brands sell direct from their own sites. SpringWell adds a well water test to WS filter orders as a required add-on and holds the order until the results are in.

SpringWell runs an affiliate program, so we may earn a commission if you buy through our SpringWell links. SoftPro has no affiliate program, only a dealer program, so our SoftPro links are plain links and earn nothing. That hasn’t changed how we compare them: the Iron Master gets our nod for high iron regardless.

Both advertise a lifetime warranty and a money-back period. SpringWell offers 6 months. SoftPro offers 6 months on the Elite and 60 days on the Iron Master. The fine print differs: SoftPro’s is a limited lifetime warranty on the core components, and SpringWell’s terms set shorter limits for some parts (5 years on electronic heads) and void coverage for systems installed on water outside their specification.

Who should get neither

• Iron plus manganese well above 10 mg/L, if you’d rather follow extension guidance than a seller’s claim. Penn State recommends oxidation, such as chlorination, followed by filtration at that level. The Iron Master’s 30 ppm figure goes past that range on SoftPro’s word alone. Our guide to iron filters vs water softeners covers the options, and our best iron filters for well water compares both brands’ filters with three others.
• Strong sulfur over about 6 mg/L. That’s where Penn State recommends continuous chlorination, even though the WS claims 8 ppm. Our guide to the sulfur smell in well water matches treatment to your level.
• City water or a well without iron. You don’t need an iron filter, and a big-box softener with a full manual is easier to check against your water. See the softeners section for sizing and picks.