Control Flow Air-Injection (AIO) Iron Filter

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"x44"	10" x 44"	1 cu ft iron-removal filter media	Control Flow metered air-injection valve
10"x54"	10" x 54"	1-1/4 cu ft iron-removal filter media	Control Flow metered air-injection valve
12"x52"	12" x 52"	1-3/4 cu ft iron-removal filter media	Control Flow metered air-injection valve
13"x54"	13" x 54"	2 cu ft iron-removal filter media	Control Flow metered air-injection valve
14"x65"	14" x 65"	3-1/2 cu ft iron-removal filter media	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: iron-removal filter media, 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 dissolved iron: clear water with no orange or brown stains
• Protects fixtures, laundry, water heaters and appliances
• Daily automatic backwash sends the trapped iron to drain
• 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.

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NWS Control-Flow air-injection iron system

Built on the Control-Flow valve platform, this air-injection iron system removes the dissolved iron responsible for orange staining and metallic taste in well water — using nothing but air and periodic backwashing.

The iron problem it solves

Dissolved iron is invisible in a fresh glass of water but oxidizes on contact with air, leaving the familiar rust stains on fixtures and laundry and a metallic edge to the taste. Over time it also accumulates inside appliances and can support iron bacteria that clog plumbing. This system stops the problem at the point where water enters the home.

The process

Water enters the tank and travels through a maintained pocket of air, where dissolved iron oxidizes into filterable particles. The media bed captures them, and the Control-Flow valve automatically backwashes the bed and restores the air pocket on schedule. There is no salt, no chemical feed, and no cartridge to replace — the system regenerates itself.

Why the Control-Flow platform matters

• Reliable, repeatable cycling from a purpose-built control valve.
• Programmable backwash so the system stays matched to your water and usage.
• Serviceable design with field-replaceable parts that keep long-term ownership straightforward.
• Whole-house protection against the rust stains that damage fixtures and laundry.

This system targets iron specifically. If your well test also shows manganese, sulfur odor, hardness, or low pH, we will recommend the right companion stages and install order so each contaminant is handled without fouling the next. It plumbs into the main line with a drain for backwash. Send your water analysis and flow needs and we will size the system precisely. Ships free in the US with manuals and expert support.

Ownership made easy

Beyond the automatic backwash, the Control-Flow valve is designed to be serviced in the field, so routine upkeep is simple and any wear parts are easy to source. Tell us your iron level and flow rate and we will size the system, preset the valve for your water, and provide the manuals and support you need to run it for years.

Put an end to rust stains for good: order today, and if you have any doubt about fit, our specialists will review your water test with you before you buy so you get exactly the right system the first time.