Best Water Filtration Systems for Well Water, Matched to Your Water Test
Quick answer: the best water filtration system for well water is the one rated for what your water test shows. For iron up to 7 ppm with a rotten-egg smell, an air-injection filter like the SpringWell WS is our top pick. For iron up to 30 ppm, choose the SoftPro AIO Iron Master. For a strong sulfur smell (up to 30 ppm of hydrogen sulfide), choose the peroxide-injection US Water Systems Matrixx inFusion. If your well has little iron and you want carbon filtration plus UV, the Aquasana Rhino Well Water with UV fits. Put a sediment filter first if your water carries sand. If a test finds coliform bacteria, disinfect the well and retest before you rely on any filter.
Our picks:
- Best overall for iron and sulfur: SpringWell WS well water filter (7 ppm iron, 8 ppm hydrogen sulfide, 1 ppm manganese)
- Best for high iron: SoftPro AIO Iron Master (up to 30 ppm iron)
- Best for a strong sulfur smell: US Water Systems Matrixx inFusion (30 ppm hydrogen sulfide, 20 ppm iron)
- Best for low-iron wells, with UV: Aquasana Rhino Well Water with UV
- Best budget pick on Amazon: iSpring WGB32BM (3 ppm iron, 1 ppm manganese)
- Best sediment pre-filter: iSpring WSP-50 spin-down filter
How we chose: we haven’t installed or tested these systems ourselves. We matched each maker’s published limits for iron, manganese, hydrogen sulfide, pH and flow to Penn State Extension’s treatment guidance. Where a detail comes only from a seller’s listing, we say so.
Start with a water test
The EPA recommends testing a private well every year for total coliform bacteria, nitrates, total dissolved solids and pH. To choose a filter, you also need these numbers:
- Iron and manganese, in ppm (the same as mg/L). Iron above 0.3 mg/L causes orange-brown stains, and manganese above 0.05 mg/L causes black ones. Penn State Extension cites these drinking water guidelines.
- Hydrogen sulfide, the rotten-egg smell. Penn State says the test must be done at home, or the sample chemically stabilized before it goes to a lab.
- pH and hardness, because most iron filters list a pH range, and hard water may need a softener after the filter.
- Sediment, if you see sand or grit in faucet aerators or the toilet tank.
SpringWell won’t ship its well filters until it has your test results, so it sells a test kit as a required add-on.
Which well water filtration system do you need?
Enter the numbers from your water test. You’ll get the equipment you need, in install order, plus the size to buy.
Your setup, in order
- Sediment filter. A spin-down filter such as the iSpring WSP-50 catches sand before it reaches anything else. Flush it as it fills.
- iSpring WGB32BM. Your iron (2 ppm) and manganese (0 ppm) are within its 3.0 and 1.0 ppm limits, and its cartridges need no drain or power. Its iron cartridge lasts about 50,000 gallons at 3 ppm, sooner with more iron. For less upkeep, the SpringWell WS backwashes itself. See the iSpring WGB32BM.
- Water softener. At 10 gpg your water is hard. A softener goes after the iron filter; see our well water softener picks.
- Bacteria: the EPA recommends testing a private well for total coliform every year. Test before you decide whether you need UV.
The picker follows Penn State Extension’s treatment guidance and the limits each maker publishes. It’s a starting point, not a substitute for a water treatment professional, especially for very high iron, manganese above 1 ppm or bacteria.
Which treatment fixes which problem
| Problem in your test | What treats it | Good to know |
|---|---|---|
| Sand, grit, cloudiness | Spin-down screen, then a sediment cartridge | Goes first, so it protects everything after it |
| Low iron and manganese, no smell | Iron-reducing cartridge or an air-injection filter | Cartridges need no drain but must be replaced; the iSpring’s is rated for 3 ppm iron |
| Iron above 5 ppm, or iron plus manganese above 10 ppm | Oxidation followed by filtration | Penn State recommends a softener for iron only below 5 mg/L, and oxidation plus filtration once iron plus manganese tops 10 mg/L |
| Hydrogen sulfide under about 1 ppm | Activated carbon | Penn State: a whole-house unit needs about 1.0–1.5 cubic feet of carbon |
| Hydrogen sulfide up to 2–3 ppm | Oxidizing filter (such as manganese greensand) or aeration | Penn State says oxidizing filters remove up to 2–3 mg/L and aeration usually isn’t used above about 2 mg/L. Makers rate some air-injection units higher. |
| Hydrogen sulfide above 6 ppm | Chemical injection: chlorine, potassium permanganate or hydrogen peroxide | Penn State calls hydrogen peroxide an excellent oxidant for hydrogen sulfide, but notes its use in private systems has been limited |
| Rotten-egg smell only from hot water | Replace the water heater’s magnesium anode rod | Penn State suggests an aluminum rod. Removing the rod entirely can shorten the heater’s life and void its warranty. |
| pH below about 6.5 | Acid neutralizer (calcite) | Goes before the iron filter. See our well water guide. |
| Hardness | Water softener | Goes after the iron filter. A filter doesn’t soften water; see softener vs filter. |
| Coliform bacteria | Shock chlorination, then disinfection such as UV | Find and fix the cause first. See UV Class A vs Class B. |
Compare the systems
| System | How it works | Iron | Manganese | Hydrogen sulfide | pH range | Drain and power |
|---|---|---|---|---|---|---|
| SpringWell WS | Air injection plus greensand fusion media, nightly backwash | Up to 7 ppm | Up to 1 ppm | Up to 8 ppm | 6.5–10 | Both |
| SoftPro AIO Iron Master | Air injection plus Katalox media, automatic backwash | Up to 30 ppm | Removes it; no limit listed | Removes it; no limit listed | Not listed | Both |
| US Water Systems Matrixx inFusion | Hydrogen peroxide injection plus catalytic carbon, backwash about every 2 days | Up to 20 ppm | Up to 1 ppm | Up to 30 ppm | 6–9 | Both |
| Aquasana Rhino Well Water with UV | Sediment pre-filter, carbon and KDF tanks, post-filter, UV | Not an iron filter; its UV needs under 0.3 ppm | UV needs under 0.05 ppm | Not listed | Not listed | No drain; outlet for the UV |
| iSpring WGB32BM | 5-micron sediment, carbon block and iron-reducing cartridges | Up to 3 ppm | Up to 1 ppm | Not rated | 6–11 | Neither |
Figures are each maker’s own, from its product page or manual. Air-injection and peroxide systems need a drain for backwashing and a well pump strong enough to backwash them; check the sizes below.
Our picks
SpringWell WS Whole House Well Water Filter System
The WS uses air injection oxidation (AIO): water passes through an air pocket at the top of the tank, which turns dissolved iron, manganese and sulfur into particles. Greensand fusion media then traps them, and a scheduled backwash each night flushes them down the drain and refreshes the air pocket. No chemicals or salt are involved. Its limits cover the iron and sulfur levels many wells have.
- Removes: up to 7 ppm iron, 8 ppm hydrogen sulfide and 1 ppm manganese (SpringWell’s figures)
- Sizes: WS1 for 1–4 bathrooms (12 gpm, 10 × 54 in. tank); WS4 for 4+ bathrooms (20 gpm, 13 × 54 in.)
- Operating range: pH 6.5–10, 25–80 psi, 36–120°F, 1 in. connections
- Warranty: lifetime, plus a 6-month money-back guarantee
Good to know: SpringWell requires a well water test with every well system order and holds shipping until the results are in. Its spec sheet also says not to use the WS where water is microbiologically unsafe, so test for bacteria too. SpringWell sells the WS paired with a softener; see our well water softener guide.
See it at SpringWellSoftPro AIO Iron Master
When iron is beyond what most filters list, the Iron Master is rated the highest of our picks: up to 30 ppm. It also uses air injection, with Katalox media and an automatic backwash, to remove dissolved and particulate iron, manganese and hydrogen sulfide without chemicals or salt.
- Removes: up to 30 ppm iron, plus manganese and hydrogen sulfide (SoftPro lists no ppm limit for those two)
- Sizes: 1.0 cubic foot (your well pump must supply at least 5 gpm), 1.5 cubic feet (7 gpm) or 2.0 cubic feet (10 gpm)
- Valve: 1 in., which SoftPro says causes no pressure loss
- Warranty: limited lifetime on the tank and core components, plus a 6-month money-back guarantee
Good to know: SoftPro notes that a larger unit or a two-filter setup may be needed near the 30 ppm top of its range. If your test shows manganese, ask SoftPro how much the Iron Master can handle before you buy. Our iron guide covers which softeners can handle iron on their own.
See it at SoftProUS Water Systems Matrixx inFusion
Penn State says hydrogen sulfide above about 6 ppm is usually treated with a chemical oxidizer. The Matrixx inFusion uses hydrogen peroxide. A Stenner metering pump injects it ahead of a catalytic carbon tank, which filters out the oxidized iron, manganese and sulfur. The valve backwashes the carbon about every two days, or daily in extreme cases. It has the highest hydrogen sulfide rating of our picks.
- Removes: up to 20 ppm iron, 30 ppm hydrogen sulfide and 1 ppm manganese; US Water Systems says it also treats iron and sulfur bacteria
- Sizes: 081-MIF-150 for 1–2 bathrooms (10 gpm, needs 5 gpm to backwash); 081-MIF-200 for 2–3.5 bathrooms (15 gpm, needs 8 gpm)
- Operating range: pH 6–9
- Includes: a 15-gallon peroxide tank with two jugs of peroxide, and a Bluetooth valve with battery backup
- Warranty: lifetime on the tank, 10 years on the valve and electronics
Good to know: unlike air-injection filters, you’ll keep buying peroxide to refill the tank. If your pump can’t supply the backwash flow for the size you need, ask US Water Systems before ordering.
See it at US Water SystemsAquasana Rhino Well Water with UV
If your well has little iron or sulfur and you mainly want better-tasting water plus UV, this is a different kind of system. Water passes through a 20-inch sediment pre-filter, an upflow two-tank bed of activated carbon and copper-zinc (KDF) media, a post-filter and a UV lamp. It needs no drain and doesn’t backwash.
- Flow: up to 14.7 gpm peak, 7 gpm rated
- Upkeep: main tank every 5 years or 500,000 gallons, pre-filter every 2 months, post-filter every 6 months, UV lamp every 12 months
- UV: certified to NSF/ANSI 55 Class B; Aquasana says it sterilizes up to 99.8% of bacteria and nonpathogenic viruses
- Limits: 100 psi maximum, 40–90°F
- Warranty: 5-year limited, plus a 90-day satisfaction guarantee
Good to know: Aquasana’s UV manual says water reaching the UV should have under 0.3 ppm iron, under 0.05 ppm manganese and under 7 gpg hardness, or be pretreated, for example softened. It isn’t an iron filter; Aquasana asks iron-water customers to call for a specialized filter. Class B UV isn’t meant to make contaminated water safe, so read the section on UV first.
See it at AquasanaiSpring WGB32BM 3-Stage Whole House Filter
For a well with modest iron and no strong smell, a cartridge system is the simplest option: no drain line, no power and no backwash. The WGB32BM uses three 20 × 4.5-inch cartridges: 5-micron sediment, coconut-shell carbon block, and an iron and manganese filter with catalytic media.
- Removes: iron up to 3.0 ppm and manganese up to 1.0 ppm, each down to 0.01 ppm (iSpring’s figures)
- Cartridge life: sediment and carbon up to 100,000 gallons or 12 months; iron cartridge 50,000 gallons at 3.0 ppm iron
- Flow: up to 15 gpm, 1 in. NPT connections
- Operating range: 25–80 psi, 40–100°F, pH 6–11
- Warranty: 1 year once you register it
Good to know: the more iron you have, the sooner the iron cartridge runs out, so at higher levels a backwashing filter costs less to run. iSpring isn’t rated for hydrogen sulfide; its FAQ only says the WGB32BM should remove some. iSpring also sells it bundled with its UVF55FS UV unit (12 gpm, 55-watt lamp). iSpring’s listing doesn’t say that UV unit is NSF certified.
Check price on Amazon With UV on AmazoniSpring WSP-50 Spin-Down Sediment Filter
Sand and grit wear out valves and clog cartridges, so a spin-down filter usually goes first. The WSP-50 traps particles on a reusable 50-micron stainless steel screen. You flush it by opening the valve at the bottom instead of replacing a cartridge.
- Screen: 50 micron; iSpring says it usually lasts 1–2 years
- Connections: 1 in. MNPT and 3/4 in. FNPT, with a hose barb on the flush valve
- Operating range: 15–115 psi, 40–100°F, indoors only
Good to know: iSpring warns that 50- and 100-micron screens can clog quickly in very sandy water, and it sells larger models (the WSP50B and WSP50J series) for that. Details are from iSpring’s Amazon listing.
Check price on AmazonThe order to install well water filters
- Sediment filter, so sand doesn’t reach anything else.
- Acid neutralizer, only if the pH is low.
- Iron and sulfur filter, so oxidized iron is caught before it can foul a softener.
- Water softener, if the water is hard.
- Carbon and UV last, because UV only works on clear water.
Each system’s installation manual comes first, so check it. Our well water softener guide has a diagram of this order.
Bacteria and UV: Class A vs Class B
A filter that removes iron and sulfur doesn’t make water microbiologically safe, and SpringWell says outright not to use its WS on unsafe water. If a test finds coliform bacteria, Penn State calls shock chlorination a common first step. Afterward, retest the well and find out how the bacteria got in.
For ongoing protection, UV is the usual add-on, and the class matters. Under NSF/ANSI 55, Class A systems are designed to disinfect water that may be contaminated. Class B systems are meant only for water that’s already acceptable to drink, to reduce harmless nuisance organisms. The Aquasana well system’s UV is Class B. If your well has tested positive, look for a Class A UV system and ask a water treatment professional to size it.
Any UV unit needs clear water: Aquasana’s manual asks for a pre-filter of at least 5 microns plus low iron, manganese and hardness before its UV.
Upkeep: what each system needs
| System | Regular upkeep |
|---|---|
| SpringWell WS | Backwashes itself nightly; SpringWell says the media lasts 10+ years |
| SoftPro AIO Iron Master | Backwashes itself; no chemicals or salt to add |
| Matrixx inFusion | Refill the hydrogen peroxide tank; the carbon backwashes about every 2 days |
| Aquasana Rhino Well with UV | Pre-filter every 2 months, post-filter every 6 months, UV lamp yearly, main tank every 5 years |
| iSpring WGB32BM | Sediment and carbon cartridges up to 12 months; iron cartridge about 50,000 gallons at 3 ppm iron |
| iSpring WSP-50 | Flush when the screen looks dirty; replace the screen every 1–2 years |
Frequently asked questions
What is the best water filtration system for well water?
It depends on your test. For iron up to 7 ppm and hydrogen sulfide up to 8 ppm, the SpringWell WS is our top pick. For iron up to 30 ppm, choose the SoftPro AIO Iron Master; for a strong sulfur smell, the Matrixx inFusion. For a low-iron well that needs carbon filtration and UV, choose the Aquasana Rhino Well Water with UV.
Do I need a whole house filter for well water?
Only if your test shows something to fix. Iron above 0.3 ppm, manganese above 0.05 ppm, a sulfur smell or sediment are the usual reasons. Some wells need only a softener, and some need nothing at all.
Will a whole house filter remove bacteria from well water?
Iron and sulfur filters aren’t designed to. If coliform bacteria show up, shock-chlorinate the well and retest, then consider a UV system certified to NSF/ANSI 55 Class A for ongoing disinfection.
What filter removes iron and sulfur from well water?
An oxidizing filter. Air-injection units like the SpringWell WS (7 ppm iron, 8 ppm hydrogen sulfide) and SoftPro Iron Master (30 ppm iron) handle both. For more hydrogen sulfide, a chemical-injection system like the peroxide-based Matrixx inFusion (30 ppm) is the usual choice.
Why does only my hot water smell like rotten eggs?
The water heater’s magnesium anode rod can react with sulfate in the water to make hydrogen sulfide. Penn State suggests replacing it with an aluminum rod rather than removing it.
Does a water filter soften well water?
No. Hardness needs a water softener, which goes after the iron filter. See water softener vs water filter and our guide to filter and softener combos.
Related guides
- Best water softeners for well water
- Best water softeners for iron
- Best water filter and softener combos
- Water softener vs water filter
- What size water softener do you need?
Sources
- Penn State Extension, Hydrogen Sulfide (Rotten Egg Odor) in Water Wells (updated December 2024) and Iron and Manganese in Private Water Systems (updated May 2025).
- U.S. EPA, Protect Your Home’s Water (private well testing).
- SpringWell, Whole House Well Water Filter System product page and specifications.
- SoftPro, AIO Iron Master product page.
- US Water Systems, Matrixx inFusion product page.
- Aquasana, Rhino Well Water with UV product page and whole house UV filter owner’s manual.
- iSpring, WGB32BM product page and FAQ; WSP-50 and UVF55FS details from iSpring’s Amazon listings.
- Michael Sheffield (NSF International), UV Treatment Systems: NSF Standard 55, Water Conditioning & Purification, May 2017 (Class A and Class B).