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Sulfur Filters for Well Water
Sulfur water filters that remove the rotten-egg smell of hydrogen sulfide from well water: air-injection (AIO) systems that handle iron and sulfur in one tank, Katalox Light and catalytic carbon filters, and chlorination systems for heavy sulfur, on Clack and Fleck valves with a 5-year valve and 10-year tank warranty. Free shipping, 120-day returns. Smell only from the hot tap? That's your water heater, not your well. The guide below sorts out which is which and what fixes it.
How to get rid of the sulfur smell in well water
The rotten-egg smell is hydrogen sulfide (Hâ‚‚S) gas, produced by sulfur bacteria in the well, the plumbing or the water heater, or dissolved from sulfur-bearing rock. Before buying anything, work out where it's coming from, because the fix depends entirely on that:
| Where you smell it | Source | Fix |
|---|---|---|
| Hot water only | Sulfur bacteria reacting with the magnesium anode rod in the water heater | Swap the anode for an aluminum-zinc or powered anode and flush the heater. No whole-house filter needed. |
| Cold and hot, every tap, from the moment you turn it on | Hydrogen sulfide in the well water itself | A whole house sulfur filter, sized to the Hâ‚‚S level below. |
| Only at one sink, or only after the water sits | Bacteria in the drain or in a dead-end of plumbing | Clean the drain trap; flush the line. Not a water problem. |
| Came on suddenly after well work, flooding or a new pump | Sulfur bacteria colonising the well | Shock-chlorinate the well first; if the smell returns within months, install a filter. |
If it's the well, get a test that reports hydrogen sulfide in ppm (mg/L) along with iron, manganese and pH. Hâ‚‚S gasses off quickly, so ask for a field test or a lab kit designed for it. Send us the report and we'll size the system.
Which sulfur filter for your Hâ‚‚S level
| Hydrogen sulfide | Technology | How it works |
|---|---|---|
| Up to about 5 ppm, with or without iron | Air-injection (AIO) filter | Draws an air pocket into the tank; oxygen oxidizes Hâ‚‚S to solid sulfur and dissolved iron to rust, the media traps both, and a nightly backwash sends it to drain. No chemicals, one tank. The standard fix for most sulfur wells. |
| Sulfur with manganese, or you want the longest media life | AIO with Katalox Light | Same air injection, with a catalytic media rated for iron, manganese and sulfur that lasts 7–10 years. |
| Above 5–6 ppm, or sulfur bacteria that keep coming back | Chlorination + retention tank + carbon filter | A Stenner pump doses chlorine, the retention tank gives it contact time to oxidize the sulfur and kill the bacteria, and a backwashing carbon filter removes the residual chlorine and the precipitate. |
| Trace odor only, no iron | Catalytic carbon filter | Catalytic carbon converts low levels of Hâ‚‚S directly; simplest install, but the media exhausts quickly above 1 ppm. |
Sulfur and iron filters: Clack and Fleck side by side
Most sulfur wells also carry iron, and the same air-injection tank treats both. Every system below ships with the media loaded, a bypass valve and the backwash schedule pre-set.
| Need | Clack | Fleck |
|---|---|---|
| Sulfur + iron, air injection | C-Series AIO Iron & Sulfur Filter (from $1,999) | 5600 SXT AIO Sulfur Filter (from $1,539) · 5600 SXT AIO Iron Filter (from $1,319) |
| Sulfur + iron + manganese (Katalox Light) | Katalox Light Filter (from $1,279) | 2510 AiQ Air Injection with Katalox Light (from $1,759) |
| Greensand Plus alternative | — | 2510 AiQ Greensand Plus (from $1,539) |
| Heavy sulfur or sulfur bacteria | 15 GPD chlorination system with Stenner pump (from $4,229) + retention tank + backwashing carbon filter | |
| Cartridge-style, no valve | Pentair whole house iron reduction filter · Crystal Quest Guardian whole house filter | |
Sizing: air-injection filters are sized to your well pump's flow, not to house size. The tank has to backwash at about 5 GPM for a 10″ tank, 7 GPM for 12″ and 10 GPM for 13″; a pump that can't deliver that leaves the media fouled and the smell back within weeks. Tell us your pump horsepower and pressure-tank size with the water test.
Where the sulfur filter goes
After the pressure tank and any sediment filter, before the softener. Sulfur and iron foul softener resin, so the filter protects it; the softener then handles hardness. UV, if you need it for bacteria, goes after everything. A well water softener alone will not remove hydrogen sulfide, and neither will a carbon-only "whole house filter" once the level is above a trace.
Frequently asked questions
Is sulfur water safe to drink? At the levels found in wells it's a nuisance, not a health risk, but sulfur bacteria and the corrosion Hâ‚‚S causes in plumbing and fixtures are worth fixing, and the smell usually comes with iron and manganese that stain everything.
Will a water softener remove the sulfur smell? No. Softeners exchange hardness ions; hydrogen sulfide is a dissolved gas. Some homeowners notice a softener reduces it slightly because the resin catches iron, but the smell stays.
Can I just shock the well? Shock chlorination kills sulfur bacteria in the well and often clears the smell for a few months. If the Hâ‚‚S is geological rather than bacterial, or the bacteria recolonise, a filter is the permanent fix.
How do I know if it's the water heater? Run cold water at a tap for a minute and smell it, then hot. Smell from hot only means the anode rod; smell from both means the well.
How long does the media last? Katalox Light and Greensand 7–10 years, plain AIO media similar, catalytic carbon 2–5 years depending on H₂S level. The air pocket and backwash need no maintenance beyond confirming the drain line runs.
Read more: Why does my water smell like rotten eggs? Related: iron filters · well water filtration systems · coliform bacteria treatment. Questions: 800-374-2143.
