Nelsen Corporation
Control Flow Air-Injection (AIO) Sulfur Filter
Control Flow Air-Injection (AIO) Sulfur Filter
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- Free shipping in the USA
- 90-day returns
- Secure checkout
A complete whole-house air-injection filter. One price includes everything listed below.
What's in the box
| Size | Mineral tank | Media | Control valve |
|---|---|---|---|
| 10"x54" | 10" x 54" | 1-1/4 cu ft sulfur-removal filter media (catalytic carbon blend) | Control Flow metered air-injection valve |
| 12"x52" | 12" x 52" | 1-3/4 cu ft sulfur-removal filter media (catalytic carbon blend) | Control Flow metered air-injection valve |
| 13"x54" | 13" x 54" | 2 cu ft sulfur-removal filter media (catalytic carbon blend) | Control Flow metered air-injection valve |
| 14"x65" | 14" x 65" | 3-1/2 cu ft sulfur-removal filter media (catalytic carbon blend) | Control Flow metered air-injection valve |
- Control valve: Control Flow metered air-injection valve with built-in air injection.
- Bypass: bypass valve (included).
- Mineral tank: black fiberglass-wrapped mineral tank with support bed and distributor.
- Media: sulfur-removal filter media (catalytic carbon blend), sized to the tank.
- Also included: 1" plumbing adapters, install and service manuals.
- Ships pre-built, ready to install, free in the US.
How it works
The valve draws a pocket of air into the top of the tank. Water passes through the air, which oxidizes iron, manganese and hydrogen sulfide into particles, and the media bed filters them out. Every day the valve backwashes the bed, sends the trapped particles to drain and refreshes the air pocket.
Media benefits
- Removes hydrogen sulfide: no rotten-egg smell
- Stops black staining on fixtures and silverware
- Daily automatic backwash keeps the bed clean
- Air injection oxidizes iron, manganese and sulfur with plain air, so no chemicals or chlorine are added
Why this system costs what it does
| This system | Typical lower-priced kits | |
|---|---|---|
| Iron and sulfur treatment | Air injection: oxidizes with plain air, no chemicals | Often chlorine or permanganate feed, or no oxidation step |
| Filter design | Automatic daily backwash keeps the media bed clean | Often a non-backwashing upflow head or a cartridge housing |
| Bypass valve | Included | Often not included or an extra option |
| Media | Named media, sized to the tank | Media type or amount often not stated |
| Delivery | Ships pre-built, ready to install | Often ships in pieces for you to assemble and load |
| Shipping | Free in the US | Free only above a minimum, or extra |
Not sure which size? Send a water test or tell us your symptoms and we will size it free.
NWS Control-Flow air-injection sulfur system
This system pairs the Control-Flow valve with air-injection oxidation to banish the rotten-egg hydrogen-sulfide odor that makes well water unpleasant to drink, cook with, and shower in — all without chemicals.
Is sulfur your problem?
A rotten-egg smell that is strongest in hot water or after periods of no use points to hydrogen sulfide. It is more than a nuisance: sulfide is mildly corrosive, can tarnish metal, and often accompanies iron, compounding staining problems. Removing it makes an immediate, noticeable difference at every faucet in the house.
How it clears the smell
Incoming water passes through a pocket of air held at the top of the treatment tank, where the dissolved sulfide gas is oxidized into a solid that the media bed filters out. The Control-Flow valve then backwashes the bed and draws a fresh charge of air automatically, keeping odor removal consistent day after day with no feed pump or chemical to manage.
Designed for hands-off ownership
- No chemical dosing to refill or calibrate.
- Programmable, self-renewing backwash from the Control-Flow head.
- Single-tank layout for a cleaner installation.
- Odor gone house-wide — showers, sinks, and appliances.
Sulfur and iron often occur together, and this platform suits both; where hardness or acidity are also present, we will stage the treatment appropriately. The system installs on the main line with a backwash drain and a standard outlet for the valve. Send us your well test and we will confirm the configuration, size it to your flow, and ship it free in the US with manuals and expert help.
Support and sizing
Getting sulfur removal right is about matching contact time to your flow, which is why we size every system to the household rather than selling a one-size unit. Send your water test and peak demand, and we will confirm the capacity, program the Control-Flow valve for your conditions, and remain on hand for any questions after it is installed.
With free US shipping, factory manuals, and a team that works with these systems every day, you can order with confidence and have fresh, odor-free water running throughout your home in short order.
