Air Injection Oxidation (AIO) Filter

Chemical-free iron and sulfur removal using natural oxidation.
Air-injection-closeup

It doesn't get any easier.

The Air Injection Oxidation (AIO) filter eliminates iron, sulfur, and hydrogen sulfide from well water using a natural oxidation process—no chemicals required. A specialized control valve maintains an air pocket at the top of the tank where contaminated water is oxidized on contact, then filtered through specialized media that captures the precipitated solids. With automatic daily backwash and multiple media options to match specific water chemistry, AIO systems deliver clean, odor-free water throughout the home without the hassle and expense of chemical feed systems.

Oxidized Iron

The Chemical-Free Solution for Iron and Sulfur

Air Injection Oxidation represents a breakthrough in well water treatment—eliminating the offensive "rotten egg" odor and rust staining caused by iron and sulfur without injecting harsh chemicals into your customers' water supply. This innovative system uses nature's most powerful oxidizer—oxygen from ordinary air—to convert dissolved contaminants into solid particles that can be filtered and removed. The result is clean, odor-free water without chlorine, peroxide, or potassium permanganate.

How Air Injection Oxidation Works

The AIO system's specialized control valve creates and maintains an air pocket at the top of the filter tank. As iron-laden or sulfur-contaminated well water enters the tank, it immediately contacts this oxygen-rich environment. The dissolved iron (ferrous iron) oxidizes instantly into rust particles (ferric iron), while hydrogen sulfide gas oxidizes into elemental sulfur. These oxidized contaminants precipitate as solid particles that are captured by the filtration media below.

An automatic daily backwash cycle removes the accumulated solids, refreshes the media bed, and regenerates a fresh air pocket—ensuring consistent performance day after day without any operator intervention. The system essentially mimics the natural oxidation process that would occur if contaminated water sat exposed to air for hours, but accomplishes it in seconds as water flows through the tank.
Iron RUst
Air Injection

Single Tank Simplicity

Traditional oxidation systems require multiple components—an aeration tank, a contact tank, and a filter—creating an unsightly, space-consuming installation prone to algae growth and bacterial contamination. The AIO filter consolidates this entire process into a single, attractive tank. There's no exposed water, no algae problems, no separate chemical feed pump to maintain, and no ongoing chemical costs. Just clean, treated water from a compact, automated system.

Media Options for Every Application

Birm Media is the economical choice for iron removal in well water with adequate dissolved oxygen and pH above 6.8. This catalytic media accelerates the oxidation of ferrous iron without adding anything to the water or requiring chemical regeneration.

Katalox Light is the premium solution for challenging water chemistry—effectively removing iron, manganese, sulfur, arsenic, and heavy metals even in low pH conditions. This advanced media provides superior oxidation and filtration performance across a wider range of water chemistries.

Centaur Catalytic Carbon targets hydrogen sulfide and also provides effective chloramine removal for municipal water applications where sulfur odor is a concern. This coal-based activated carbon offers exceptional adsorption capacity and extended service life.
Carbon
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Professional Control, Proven Performance

The AIO system uses Clack's WS1 solid-state control valve, providing the same professional automation and reliability found in premium water softening systems. The intuitive display shows days until next backwash, volume remaining, current flow rate, and total volume processed. Four programmable backwash initiation methods allow precise configuration for any application, while the optional double backwash feature ensures optimal media cleaning and air pocket regeneration.

Available in four configurations handling 5 to 15 GPM backwash flow rates, AIO systems accommodate a wide range of residential well water applications. The automated operation means your customers never have to think about their water treatment—the system handles everything automatically while they enjoy clean, odor-free water throughout their home.

Media Options for Every Application

Birm Media is the economical choice for iron removal in well water with adequate dissolved oxygen and pH above 6.8. This catalytic media accelerates the oxidation of ferrous iron without adding anything to the water or requiring chemical regeneration.

Katalox Light is the premium solution for challenging water chemistry—effectively removing iron, manganese, sulfur, arsenic, and heavy metals even in low pH conditions. This advanced media provides superior oxidation and filtration performance across a wider range of water chemistries.

Centaur Catalytic Carbon targets hydrogen sulfide and also provides effective chloramine removal for municipal water applications where sulfur odor is a concern. This coal-based activated carbon offers exceptional adsorption capacity and extended service life.

 

Select the Best System for your Application

APPLICATION NOTES: AIO units should be installed after sediment or neutralizing filters, chlorination and de-chlorination and before a water softener and any other downstream treatment equipment. Do not use AIO units for treatment of water that contains bacteria or for water of unknown quality.

Application: For Iron removal utilizing Birm media

Media (cuft) Media Type Support Gravel Tank Size Overall Height Backwash Flowrate Shipping Weight

1.5 (CF)

Birm
25 lbs
10 x 54
62"
5.0 gpm
83 lbs.

2.0 (CF)

Birm
50 lbs
13 x 54
62"
8.0 gpm
132 lbs.

2.5 (CF)

Birm
50 lbs
14 x 65
73"
10.0 gpm
167 lbs.

3.0 (CF)

Birm
50 lbs
16 x 76
84"
15.0 gpm
183 lbs.

Application: For Sulfur, Hydrogen Sulfide and Chloramines removal utilizing Calgon Centaur Coal Base Catalytic Activated Carbon

Media (cuft) Media Type Support Gravel Tank Size Overall Height Backwash Flowrate Shipping Weight

1.5 (CF)

Centaur
25 lbs
10 x 54
62"
5.0 gpm
83 lbs.

2.0 (CF)

Centaur
50 lbs
13 x 54
62"
8.0 gpm
132 lbs.

2.5 (CF)

Centaur
50 lbs
14 x 65
73"
10.0 gpm
167 lbs.

3.0 (CF)

Centaur
50 lbs
16 x 76
84"
15.0 gpm
183 lbs.

Application: For Sulfur, Iron, Manganese, Color, Odor and Heavy Metals removal utilizing Katalox Light advanced filtration media

Media (cuft) Media Type Support Gravel Tank Size Overall Height Backwash Flowrate Shipping Weight

1.5 (CF)

Katalox
25 lbs
10 x 54
62"
5.0 gpm
83 lbs.

2.0 (CF)

Katalox
50 lbs
13 x 54
62"
8.0 gpm
132 lbs.

2.5 (CF)

Katalox
50 lbs
14 x 65
73"
10.0 gpm
167 lbs.

3.0 (CF)

Katalox
50 lbs
16 x 76
84"
15.0 gpm
183 lbs.

System Features:

  • Solid state microprocessor with easy access front panel settings

  • Front panel display for time of day, days until net regeneration, volume remaining, current flow rate and total volume used (totalizer) and Tank In Service indication

  • Four methods to initiate regeneration; meter immediate, meter delayed, time clock delayed or pressure differential

  • Optional double backwash feature offers optimum

  • Adjustable cycle times with 6-cycle control delivers controlled backwash, slow rinse, second backwash, fast rinse, refill, and downflow service

  • Coin Cell Lithium battery back-up with 8 hour carry over

  • 12-volt output AC adaptor provides safe and easy installation

  • Reliable and proven DC motor, seal spacer stack and piston

System Benefits:

  • Eliminates the offensive “Rotten Egg” odor

  • A single tank solution that replaces unsightly chlorine contact tank and aerator tank

  • Eliminates unsanitary conditions and algae growth associated with aeration tanks

  • No harsh chemicals or salt for regeneration

  • Cleaner, safer, better tasting water throughout the home

  • Reduce wear and tear and maintenance requirements on water appliances

  • Better tasting water for drinking, cooking and ice cubes

  • Several media types available to meet specific treatment goals

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