Air Injection Oxidation (AIO) Filter

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

Well Water Treatment Made Simple

AIO reduces iron staining and sulfur odors using air oxidation and filtration. Choose the media and system size for your water chemistry and treatment goals. The air pocket is maintained inside the filter tank, and automatic backwashing removes accumulated solids without manual daily operation.

Oxidized Iron

Air-Powered Iron and Sulfur Treatment

Oxygen from ordinary air converts dissolved contaminants into particles the media can capture. AIO treats well water without a separate chlorine, peroxide, or potassium permanganate feed system. It is intended for residential well-water applications where rust deposits and “rotten egg” odors are the primary concerns.

How AIO Works

Incoming water passes through an air pocket, where iron and hydrogen sulfide oxidize into particles trapped by the media below. The control valve maintains the air pocket at the top of the tank throughout the service cycle.

Automatic backwashing flushes out solids, cleans the media, and replenishes the air pocket. Performance depends on water chemistry, media selection, and sizing.
Iron RUst
Air Injection

Single Tank Simplicity

Air injection and filtration share one enclosed tank, reducing the space and equipment needed for separate aeration and contact tanks. Automatic backwashing keeps routine operation straightforward. The closed design avoids exposed water and eliminates a separate chemical feed pump and its ongoing chemical supply.

Choose Your Media

  • Katalox Light: For iron, manganese, sulfur, and broader treatment needs.
  • Centaur catalytic carbon: For hydrogen sulfide and sulfur-related odors.
  • Birm: For iron removal with adequate oxygen and suitable pH.

Compare configurations in the ordering tables below.
Carbon

Professional Control, Proven Performance

The Clack WS1 valve automates backwashing and displays current flow, remaining volume, total water usage, time of day, and time until the next backwash.

  • Four cycle-initiation methods: meter immediate, meter delayed, time clock delayed, or pressure differential
  • Adjustable cycles and optional double backwash
  • Lithium battery backup with eight-hour carryover
  • 12-volt AC adapter

Sizing: Table backwash rates describe cleaning requirements, not service flow. Confirm the available backwash water supply.
Air-injection-closeup

Select Your AIO System

Install after required pretreatment and before a softener or downstream equipment. Required pretreatment may include sediment removal, pH correction, chlorination, and dechlorination, according to feedwater conditions. Do not use for water containing bacteria or water of unknown quality.

Katalox Light — Broad-Spectrum Treatment

For iron, manganese, sulfur, color, odor, and certain heavy metals. Select media and system size using a water analysis.

Media (cu.ft.) Media Type Support Gravel Tank Size Overall Height Backwash Flow Rate Shipping Weight Qty

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.

Centaur Catalytic Carbon — Sulfur & Odor Reduction

For hydrogen sulfide, sulfur-related odors, or chloramines. Uses Centaur coal-based catalytic activated carbon.

Media (cu.ft.) Media Type Support Gravel Tank Size Overall Height Backwash Flow Rate Shipping Weight Qty

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.

Birm — Iron Removal

For iron removal when dissolved oxygen and pH meet Birm’s operating requirements.

Media (cu.ft.) Media Type Support Gravel Tank Size Overall Height Backwash Flow Rate Shipping Weight Qty

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.

System Features

  • Three application-specific media options
  • Multiple tank and media-volume configurations
  • Automatic backwashing with programmable controls

Compare media volume, tank size, overall height, required backwash flow, and shipping weight in the tables above before choosing a configuration.

System Benefits

  • Reduces rust staining and sulfur odors
  • Compact, enclosed single-tank treatment
  • No separate chemical feed system
  • Media selection matched to your water

Ready to get started?

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