This page is a complete buying guide for whole-house iron filters for well water. It covers: which iron filter to buy by household size, iron level, and well pump output (1.0, 1.5, 2.0, 2.5, or 3.5 cubic foot Katalox Light systems with Fleck 2510AIO valves), a brand comparison against SpringWell, US Water Systems, IronPro, and Culligan, how air injection iron filtration works, DIY installation steps and requirements, iron/sulfur/manganese symptom diagnosis, verified customer reviews, and expert sizing help. All systems ship free to all 50 US states. Prices range from $1,895 to $2,895. Mid Atlantic Water has been specializing in well water treatment since 1997, with a team carrying 32 years of well water expertise.
By Aidan· 32 Year Water Expert, Mid Atlantic Water ·
A whole-house iron filter for well water removes dissolved iron, manganese, and hydrogen sulfide (rotten-egg smell) at the point of entry, treating every tap, faucet, and appliance downstream. The right system handles up to 30 ppm iron in a single tank, with no chemicals, no salt, and no cartridge replacements. The systems on this page are built around the Fleck 2510AIO valve and Katalox Light media, the standard residential air-injection setup that has outperformed Birm, Greensand, and Filox in our 32 years of well-water installs.
Removes up to 30 ppm iron
No chemicals, no cartridges
Installs in 2-4 hours
Free shipping & 5-10 yr warranty
Tested over 30+ years
30-day return policy
Watch the 12-minute complete guide
After 32 years of expert experience, with over 10,000 customers served since we started Mid Atlantic Water in 1997, these iron filters have proven (through real-world evidence) to handle every iron level from 0.3 to 30 ppm. If one fails, it's because someone undersized, not because the media stopped working. These are the industry-proven, professional-grade iron filters for well water iron problems.
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Air Injection Iron & Sulfur Filters for Well Water
Our best-selling whole-house iron and sulfur filter systems. Standalone Katalox Light AIO in five sizes, picked by household size and well-pump output: 1.0 cu ft for 1-3 people up to 3.5 cu ft for 5+ people and high simultaneous flow. Same single tank removes dissolved iron, manganese, and hydrogen sulfide (rotten egg smell).
Iron Filter and Water Softener Combos for Well Water
Bundled combo systems for well water homes with both iron and hard water. One iron filter plus one water softener, plumbed in series, shipped together. Save $200-400 vs. buying separately.
Ozone & Chemical Oxidation Iron Filters for Extreme Iron
Advanced ozone and chemical oxidation iron removal systems for extreme well water conditions (iron above 30 ppm, heavy iron bacteria, or high tannins) where standard air injection isn't enough.
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Iron Filter Comparison
Mid Atlantic vs. SpringWell, US Water, IronPro & Culligan
Honest head-to-head: how the Fleck 2510AIO 2.0 cu ft compares to the systems most well-water shoppers are also looking at. Specs are pulled from each company's published product pages, May 2026.
MAW Fleck 2510AIO 2.0
SpringWell WS1
US Water Oxi-Gen
IronPro 2 (Amazon)
Culligan installer
System type
AIO (air injection)
AIO (air injection)
AIO (air injection)
Salt softener + fine mesh resin
varies by quote
Max iron capacity
30 ppm
7 ppm
8 ppm
6 ppm (ferrous only)
varies by quote
Sulfur (H₂S) handling
Yes, 10 ppm in same tank
Yes (8 ppm)
Yes
No
Yes (often upsold)
Manganese
Yes (15 ppm)
Yes (1 ppm)
Yes
Yes (6 ppm)
Yes
Chemicals required
None
None
None
Salt + resin cleaner
Often chlorine
Media lifespan
7-10 years
10+ years
4-5 years
5-10 years
service contract
Self-install
Yes (2-4 hrs)
Yes
Yes
Yes
No
Phone consult included
Yes, with Aidan
Limited
Limited
None
Yes (sales-led)
Warranty
5 yr valve / 10 yr tank
Lifetime tank & valve
10 yr tank / 7 yr valve
5 yr valve / 10 yr tank
1-3 yr varies
Price (system only)
$2,095
~$2,200
~$2,695
~$939
$3,500-7,000
The IronPro 2 is the most-bought iron filter on Amazon, but it's a salt-based water softener with fine mesh resin, not a true oxidizing iron filter. It handles clear-water (ferrous) iron only and can't touch sulfur or hydrogen sulfide. Most of our customers tested at 5-15 ppm iron and would need an AIO system. The Culligan number is what we hear back from customers who got quotes; it varies by region and rep.
A note on "lifetime" warranties: SpringWell's published warranty terms only treat the lifetime claim as a defect-against-materials guarantee. Their fine print caps the electronic control head at 7 years and mineral tanks at 10 years, and the 10-year tank coverage only applies to tanks 14" or larger (the WS1 ships with a 10" tank). Our 5-year valve / 10-year tank warranty is what we'll honor on paper without an asterisk.
Step 1: Find Your Problem
What are the signs of iron in well water?
The five tell-tale signs of iron in well water are: orange or rust-colored stains on sinks, tubs, and laundry; metallic-tasting tap water; rotten-egg smell (hydrogen sulfide, often paired with iron); pink or rusty slime in toilet tanks (iron bacteria); and orange specks or sediment in the bottom of glasses. If you see any of these, you have iron (or its cousins, sulfur and manganese) in your well water. The standard iron treatment for well water, a single whole-house air-injection iron filter, fixes all of them in one tank.
Orange or rust stains
On sinks, tubs, toilets, or laundry. Bleach won't touch them.
→YESIron filter fixes this
Rotten egg smell
Especially from hot water. That's sulfur (hydrogen sulfide) gas.
→YESSame filter fixes this
Metallic taste
Water tastes like a penny. Coffee and tea taste off.
→YESIron filter fixes this
Black specks or dark spots
Tiny black bits in your water, or dark stains on fixtures. That's manganese.
Size based on iron level and number of people in the home. Most households land on 2.5 cu ft (3-8 people, 3-5 baths), our most-recommended pick. The 1.0 cu ft handles up to 20 ppm iron (we cap it lower than the manufacturer's 30 ppm because the smaller tank gives water less contact time with the media); the 1.5 cu ft and larger all handle up to 30 ppm, the manufacturer's spec. Larger sizes deliver higher peak service flow rate (so multiple fixtures don't drop pressure), not more iron capacity. Same Fleck 2510AIO valve and Katalox Light media in every size. We've installed thousands of these on wells across the country. One constraint to check before you order: your well pump has to sustain the backwash GPM in the row you pick, or the system can't self-clean.
The maximum iron concentration (in ppm, parts per million) the system can remove without breakthrough. Typical well water tests between 0.3 and 10 ppm; above 30 ppm, call us first. If you don't know your iron level, get a water test before sizing.
Max flow before pressure drop
This is a CEILING, not a requirement. It is how much water the system can pass through at the same time before you would start to notice a drop in pressure at your showers and faucets. Your well pump's GPM does not have to match it. If your peak simultaneous demand is lower than the rating, you simply have more headroom. If your well delivers fewer GPM than the rating, the system still works perfectly; you just never reach the ceiling. For reference, the 17 GPM rating on the 2.5 cu ft tank covers 3 to 5 bathrooms running at once with no perceptible pressure loss. The smaller and larger tanks handle proportionally less or more. (Note: this is separate from the backwash GPM your well pump DOES need to sustain for the system to self-clean. See that row below.)
Backwash Required
The minimum GPM your well pump must sustain for 8-10 minutes while the system self-cleans (every 2-4 days, usually at 2 AM). If your pump can't deliver this, size down.
An air injection oxidation (AIO) iron filter draws a pocket of compressed air into the top of a single tank, oxidizes dissolved (ferrous) iron, manganese, and hydrogen sulfide as the well water passes through, then traps the now-solid particles in a bed of Katalox Light media. Every 2-4 days the valve automatically backwashes the trapped contaminants to the drain. No chemicals, no salt, no cartridges, no electricity beyond a 24V control board.
01
Air Injection Oxidizes Iron
The Fleck 2510AIO valve draws air into the tank on each backwash cycle, creating an oxygen-rich pocket at the top. When water passes through, dissolved iron and sulfur oxidize on contact.
02
Katalox Light Traps Particles
Oxidized iron particles are caught by the Katalox Light media bed. This MnO2-coated media has 10x the surface area of traditional Birm or greensand, so it captures more iron with less media.
03
Automatic Backwash Cleans Itself
The valve automatically backwashes on a set schedule (usually every 2-3 days). Water flows upward through the tank, flushing trapped iron to drain. No chemicals, no cartridges, no manual maintenance.
Installation
We ship it. Your plumber installs it.
Every basement is different, so we recommend hiring a licensed plumber. The job is straightforward for anyone who does residential plumbing, and Aidan is a phone call away if your plumber has questions.
2-4 hrs
Typical install time for a licensed plumber. Straightforward residential plumbing, no concrete work, no specialty tools.
1"
Plumbing connections on the inlet, outlet, and bypass. CPVC or PEX with SharkBite fittings both work.
100%
Phone support included. Aidan walks your plumber through anything unusual about your specific setup.
What to have ready
120V outletWithin 6 ft of the tank. Not on a light switch or a GFCI that may trip.
Floor drain or waste pipeWithin 20 ft for the 1/2" backwash drain line. A laundry tub works too.
1" plumbing with shut-offsInlet and outlet, with valves upstream and downstream to isolate the system.
Clear floor spaceNear your main water line where the plumber can work comfortably around the tank.
What your plumber will do
Position the tank after the sediment filter and level it using the adjustable boot.
Load the Katalox Light media through the fill port using the included funnel.
Attach the stainless-steel bypass valve to the Fleck 2510 valve head.
Plumb 1" inlet (IN) and outlet (OUT). CPVC with solvent cement or PEX with SharkBite fittings both work.
Run 1/2" drain tubing from the valve drain port to a floor drain or waste pipe, maintaining an air gap.
Plug the transformer into a standard 120V outlet.
Open the water valve slowly, 1/4 turn at a time. A sudden rush shifts the media bed. Flush 10 to 15 minutes.
Run a manual backwash cycle to settle the media and purge air.
Set the time of day on the valve. The default backwash schedule (every 2 to 3 days at 2 AM) works for most wells.
Show your plumber exactly what's going in. The system builder generates a plumbing schematic for your specific setup. Send it to your plumber before install day.
Katalox Light vs. Birm vs. Greensand Plus vs. Filox
Not all iron filter media is the same. Katalox Light is an MnO2-coated media that handles the highest iron levels of any catalytic media (up to 30 ppm), works across the widest pH range (5.8-10.5), requires no chemical feed, and at 66 lbs/ft3 weighs less than half of what Filox does -- so a standard residential well pump can backwash it without issues.
Every review is independently collected and verified by Stamped.io, a third-party review platform. We cannot edit or remove reviews.
★★★★★
Solved my very high iron issues! Great customer service!
I have well water with over 20 ppm ferrous and 7 ppm of ferric iron, along with manganese and some sulfur. I was rejected by local water companies saying they could not help me with my high iron issues. I purchased two Fleck 2.5 cu. ft. 2510AIO Iron Filter tanks with Katalox-Light media and air injection from Mid-Atlantic Water. The pH goes up to about 9 initially, but comes down eventually. Aiden, the owner, was extremely helpful and responsive to my numerous calls and texts to get the tank set up and running. Wow...and now the tanks reduced the iron to literally zero! Highly recommend this type of iron filter to remove very high levels of iron!
AH
Amy H., United States
Verified Buyer
Fleck 2510AIO 2.5 Cu Ft Iron Filter · October 2024
★★★★★
Amazing set up!
Straight forward installation. In, out, and the drain. Ran a back wash cycle then put it online and it works GREAT! I am on a well with mildly acidic water around 6.5 with ferrous iron in it so this was the perfect solution for me. Cleaned out the iron and raised the ph to 7.5. Culligan tried to sell me a softener and an acid neutralizer for $10k. This was a much more affordable set up and without all the maintenance of a softener.
DH
Dustin H., United States
Verified Buyer
Fleck 2510AIO 2.5 Cu Ft Iron Filter · June 2024
★★★★★
Self install iron and water softener
The whole process from start to finish was great. I got a lot of online and immediate tech-support from Aiden. The only question is that some of the directions that came with it were not intuitively obvious. Which caused me to have more contact and request more support. Other than that Iron breaker working perfectly. I would highly recommend this product and company and would use them again!
JD
John D., United States
Verified Buyer
Iron Filter & Water Softener Combo · August 2020
FAQ
Frequently asked questions
Yes. A whole-house iron filter using air injection oxidation (AIO) and Katalox Light media removes up to 30 ppm of dissolved iron, plus manganese and hydrogen sulfide, in a single tank, without chemicals. It installs at the point where well water enters your house and treats every fixture downstream.
For 90% of well-water iron problems, an air-injection iron filter with Katalox Light media is the best choice. It handles up to 30 ppm iron, treats sulfur smell at the same time, requires no chemicals, and lasts 7-10 years before media replacement. Cheaper Amazon units (IronPro 2, iSpring) are rated for 3 ppm and fail above that.
Yes, when properly sized. A correctly sized AIO/Katalox filter removes 99%+ of dissolved iron, verified by post-install water tests. The failure mode is undersizing: pairing a 1.5 cu ft tank with a 5+ bathroom home means short service runs, frequent backwash, and pressure drop during peak demand. Match the size to your household flow and well-pump output, not just the iron level.
Iron itself isn't toxic at typical well-water levels (under 30 ppm), but it indicates other concerns. Iron-rich water often hosts iron bacteria, traps manganese, and harbors biofilm in pipes. The EPA's secondary (aesthetic) standard is 0.3 ppm. Above that you'll get stains, taste, and stink. We recommend filtering it.
Usually yes, because what most people call iron bacteria isn't actually iron bacteria. Nine out of ten times, the orange slime you're seeing in toilet tanks, filter housings, or on fixtures is just clear-water iron that oxidizes the moment it hits air. An air-injection iron filter with Katalox Light removes it completely.
True iron bacteria is rare. The tell-tale signs: a distinct musty or swampy odor in the water, and lumpy / stringy slime floating on top of the water in the back of your toilet tank (not just orange staining). If that sounds like your water, call us before ordering. True iron bacteria sometimes needs a one-time well treatment before the filter goes in, and we'd rather diagnose it on the phone than have you put a system on a well that needs to be shocked first.
The 1.5 cu ft model handles up to 15 ppm, the 2.0 cu ft handles up to 20 ppm, and the 2.5 cu ft handles up to 30 ppm of ferrous (dissolved) iron. All three also remove hydrogen sulfide (rotten egg smell) and manganese.
If your iron levels exceed 30 ppm, call us. We can design a custom solution with pre-treatment.
No. The Fleck 2510AIO uses air injection to oxidize iron, not chlorine or potassium permanganate. The only consumable is the Katalox Light media, which typically lasts 7-10 years before needing replacement.
Yes. Most homeowners install these systems in 2-4 hours with basic plumbing skills. You need 1-inch plumbing connections, a nearby drain for backwash water, and a standard electrical outlet.
We include detailed instructions and Aidan is available 7 days a week if you get stuck. Many customers also hire a local plumber for $200-400.
Katalox Light has 10x the surface area of Birm and doesn't require the chemical feed that greensand needs. It handles higher iron levels (up to 30 ppm vs 10 ppm for Birm), lasts longer (7-10 years vs 3-5 for Birm), and backwashes with less water because it is lighter.
It is also effective across a wider pH range (5.8-10.5) compared to Birm which requires pH above 6.8.
Almost none. The system backwashes automatically on a timer you set (typically every 2-3 days). There are no filters to change, no chemicals to add, and no cartridges to replace.
The Katalox Light media lasts 7-10 years under normal use. The Fleck 2510AIO valve is rated for 27+ years. The only ongoing cost is a small amount of water and electricity during backwash cycles.
Size by the number of people and bathrooms in your home. The 1.5 cu ft (10x54 tank) covers 1-2 people with 1-2 bathrooms. The 2.0 cu ft (12x52) covers 2-4 people with 2-3 bathrooms. The 2.5 cu ft (13x54) covers 4+ people with 3-5 bathrooms.
If you have very high iron (above 15 ppm) or high water usage, size up. Call Aidan with your water test results and he will tell you exactly which size fits your situation.
Paste your water test below. Aidan replies with a sized recommendation, install notes for your basement layout, and a discount code if it's a multi-tank order. Same-day during business hours, next morning otherwise.
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