Aeration for life™

At EDI, we design, supply, install and service engineered aeration solutions to help you optimize your wastewater treatment.

GWI’s Water Technology Company of the Year Nominee.

Axius Water is thrilled to stand side by side with other water industry giants.

Are you ready for BABA?

We help you comply with Build America-Buy America requirements for IIJA/BIL funding

New 2022 Sustainability Overview

Need to comply with BABA to receive U.S. IIJA/BIL funding? We can help…

We support engineers from the first design, contractors with the easiest installation processes, and plant operators over the full life of any aeration project.

That’s our AERATION FOR LIFE promise.

Whether municipal or industrial, dischargers can offload their specialized care and maintenance to EDI, for long-term performance and system reliability.

In order to rely on your aeration system, you want it designed by experts to meet your specific needs. For nearly half a century, EDI has been making customized aeration solutions accessible to all wastewater treatment plants with:

What other operators have said:

“While working with SiteWorks crews, we have been able to do improvements to the system to make it run more efficiently. The crews are well-trained on the systems and know what it takes to fix any problem that may come up.”

— Larry, Operator – City of Linn

What other contractors have said:

“We purchased the Extended Warranty with annual inspection to make sure the performance stays top-notch. They have lived up to their guarantee on this spectacular design and installation.”
— Eddie Sechrest, Midwestern Refinery Contractor

What other operators have said:

“The crew you sent here was one of the best I have ever had the pleasure to work with.”
— Maury Dobbs, Seward, IL

What other directors have said:

“The project has been a great success, providing EDI technology is not only reliable, but also simple and easy to install.”
— Bengt Lindqvist, Managing Director Bentrex Oy

What other directors have said:

“Today, we are exceeding our original (effluent improvement) goals, and can reduce total phosphorus… due in large part to the robust system design.”
— Frank DiScullion, Director at City of Lebanon Authority

What you’ll find on this page: 

Advanced Aeration

Optimal System Configuration and Design with Disc, Tube, and Panel Diffusers

Industrial Solutions

Design | Installation | Service

Aftermarket Parts

Suppliers of Diffusers, Replacement Membranes, and Specialty Diffuser Items Across All Brands


System Evaluation | Installation | Maintenance | Service Contracts

High-Efficiency 9-Inch Disc Aeration

Introducing EDI's answer for specifications built around 9-inch solvent-welded disc aeration
Learn more...


Our fine and coarse bubble aeration technologies are ready to form an integral part of your biological wastewater treatment system

In most modern treatment systems, aeration is the critical component…

that adds the required air into wastewater so micro-organisms can break down contaminants and pollutants.

It is basically farming bacteria using air to treat wastewater. But it is more than just adding air to a system, to avoid using more energy than required for each situation and to meet or exceed limits, this biological process is optimized by engineering for desired flow, load, capacity, influent type, treatment process type, desired effluent quality, capital investment, operation costs, and energy savings. Add on our long-term maintenance and upgrade support and your wastewater treatment system will be fully cared for by our Aeration for Life promise. EDI has been providing aeration excellence while pioneering and revolutionizing aeration technologies for nearly half a century – since 1975.

How an EDI Engineered Aeration system works:





FlexAir® Pro Fine-Bubble

FlexAir® Basic Fine-Bubble

CoarsAir™ Coarse-Bubble

  • CoarsAir Hex
  • CoarsAir Max
  • CoarsAir Wide-Band (SS)
  • CoarsAir PermaCap
  • CoarsAir FlexCap
  • CoarsAir AirCone


SiteWorks™ teams provide expert installation & maintenance services

Aftermarket Parts is your one-stop online shop for parts for all brands of aeration systems.


Efficiently and reliably transferring oxygen to water.

Maximum Performance and Flexibility to Optimize Your Aeration System.

Fine bubble aeration is a form of subsurface aeration that introduces air into water via very small (or fine) bubbles (<2mm in size).

The fine bubbles produced from the pores promote oxygen transfer though their higher collective surface area of air-water interface compared to coarse bubble systems; diffusing more air into the wastewater as a result.

The low buoyancy of fine bubbles also contribute to the high oxygen transfer. A slow rise to the surface allows more oxygen to transfer from the bubble, and to dissolve into the water at all levels before reaching the surface.

Fine bubble diffuser configurations are designed to be highly efficient; it provides 6–7 lb/O² hp-h, making it 40–60% more energy efficient than coarse bubble or other types of aeration systems.

Use SiteWorks for your complete single-source easy installation and upgrade to fine bubble aeration from any other system type.

We are making a difference in the water reclamation industry.

Take a moment to worry about your aeration one last time before clicking here, and we will take it from there.


More mixing, less maintenance.

Coarse bubble diffuser systems offer low-maintenance mixing.

Where oxygen transfer isn’t your limiting factor, EDI’s full-range of CoarsAir* coarse bubble diffuser platforms provide mechanical reliability, application flexibility, and ease of installation and maintenance.

The primary advantage of this technology is its robust design and ability to mix heavy concentrations of solids. There are no moving parts in the water and the large bubble orifices can be less prone to clogging; making this a robust solution for difficult aeration/mixing applications

Coarse bubble diffusers get their name from the type of bubble they produce, i.e. greater than 4mmØ bubbles. The diffusers are attached to a PVC or stainless steel air supply line fixed to the bottom of the treatment basin or tank. When large bubbles are released at the bottom, water is pulled toward the surface along with the large bubbles mixing the wastewater in the basin or tank.

*CoarsAir Includes, MaxAir SS and PVC, HexAir, PermaCap and other EDI coarse-bubble technologies

We’ve designed our processes and hardware with you in mind.

From introduction through implementation, we supplement engineers and consultants’ workflow to satisfy your municipal/industrial clients by expediting the entire project, providing superior technologies and offering responsive service throughout.

Allow EDI support you with unique process design and high-value engineered solutions. We offer a wide range of high-quality diffused aeration products that you can trust, and providing optimized energy efficiency, performance, as well as lifelong maintenance and upgrade services for your client.

Our simple process outlines what you can expect, although our responsive team is always happy to consult further at any point:

Submit your RFP

...or simply reach out to our friendly staff and have them walk you through the details we need. Yes, you can get started today!


You receive design support and final design-ready drawings, with the support of our expert engineers who work with you to identify the solution to your wastewater treatment requirements.

We Supply Our Exclusive Technologies

Our exclusive technologies will set your project apart and are delivered to site on time to keep contractors on schedule and accountants happy. Our qualified staff commissions our installations, assuring clients that our technologies work to specification and equipping operators with the knowledge they need from day one.

We stand behind our Aeration for Life™ promise

We will be your partner in treatment, long after the shovels and hardhats have left the site. Our support teams ensure our technologies exceed expectations, and they equip operators with the knowledge they need to keep it that way. Throughout the long life of the technology, our friendly SiteWorks staff is ready to supply any needed service, and likewise our Aftermarket Parts team with the parts you need.


What you need to know about Environmental Dynamics International (EDI)...

EDI has been leading the wastewater aeration revolution since 1975.

We are focused on helping our municipal and industrial clients manage their environmental impact with the lowest possible lifecycle cost. EDI is recognized for excellence in exports and has received numerous awards including: State of Missouri “Small Business Exporter of the Year” Award and US Dept. of Commerce President’s “E” Award for Excellence.

Founded in 1975 with a focus on Biological Treatment and Advanced Technology Diffused Aeration Systems, the company continues to grow with its diverse product portfolio and unparalleled service capabilities; offering integrated aeration system solutions for Municipal and Industrial Water Reclamation Facilities. The corporate campus in Columbia, Missouri, USA is the R&D, engineering and design management, and manufacturing center for the organization; featuring world-class test facilities for oxygen transfer, material performance, and product design.

EDI continues to support new plant construction, existing facility upgrades, and long-term infrastructure demands on a global scale. To support our global customer base, we have created a network of direct sales representatives and local independent partners. EDI diffused aeration products have been installed in over 8,000 aeration systems in over 100 countries serving over 400 million people.

In June 2020, EDI was acquired by KKR and XPV Water Partners and included to the water quality platform now known as Axius Water. Axius Water focuses on promoting water quality and United Nations Sustainable Development Goal #6 by addressing the global wastewater nutrient crisis. Being a part of this platform enables EDI to hold a much stronger position in the market with enhanced, synergistic capabilities and a wider range of solutions in our portfolio of biological treatment technologies. Our vision is for every drop of wastewater to meet the highest nutrient standards at the lowest possible energy footprint.


People Served Worldwide

Countries with Running Systems

Proud Water Environment Federation (WEF) member