Fine-Bubble Aeration

for specifications that call for solvent-welded 9-inch disc diffusers

meeting your basic needs, better.

FlexAir Basic conforms to the most common aeration specification with a quality, American-made (or UK-made) product.

If your specification calls for a solvent-welded, disc diffuser-based system, you need to meet FlexAir Basic. Designed and built by EDI’s aeration engineers to meet the requirements of this common spec, FlexAir Basic is a high-quality product delivering high-efficiency aeration.

To help American customers access the Build America Buy America (BABA)-dependent Bipartisan Infrastructure Law (BIL) and Infrastructure Investment and Jobs Act (IIJA) funding to get your project moving, FlexAir Basic is made in our Columbia, Missouri facility.

For our customers around the globe, FlexAir Basic is also made in our Banbury, UK facility, allowing us to ship from the facility that gets your aeration system to your site as quickly and cost-effectively as possible.

Do I need FlexAir Basic or FlexAir Pro?

Is your project optimizing for total lifecycle cost?

You need FlexAir Pro! EDI’s aeration experts are able to apply our comprehensive range of membranes, diffusers, and configurations to your specific needs to ensure your plant has the reliability, efficiency, and ease of installation to ensure your aeration’s total cost of ownership is the lowest it can be.

Do you have a spec written around solvent-welded 9-inch disc diffusers?

You need FlexAir Basic! It is designed by EDI’s aeration experts to meet this common specification (sometimes sold under the brand names Sanitaire Silver Series II, SSI AFD, and Aquarius Quantaer), and built in Columbia, Missouri to meet stringent Buy American regulations, or in Banbury, UK to expedite delivery to European customers.

Is your project pre-spec?

You need to check out FlexAir ProYou owe it to your project to discover how EDI aeration experts can optimize your plant’s performance and its cost by using higher-density diffusers, longer-lasting membranes, or more flexible configurations.

Does your project have specific needs, e.g. high-strength industrial waste, aggressive efficiency targets, etc.?

You definitely need to check out FlexAir ProEDI has arguably the widest range of aeration tools in the industry, including proprietary advances particularly effective at providing higher-density aeration, longer-lasting membrane performance, and ease of maintenance.

FlexAir basic Fine-Bubble Disc  aeration


  • High-efficiency aeration with low capital and operating costs
  • Conforms to specifications for common solvent-welded disc aeration systems
  • Made in Columbia, Missouri for full Build America Buy America (BABA) and IIJA compliance
  • Ships quickly with low minimums
  • Efficient installation available from EDI SiteWorks™ experts offers the assurance of a single point of responsibility



How it works

Ready to meet your spec. 

FlexAir Basic systems include pipe and supports in addition to diffusers. Laterals come with disc holders and connections installed, and distribution headers have connections installed.

Design Airflow: 0-9.5 m³N/h (0-6 scfm)
Overall Diameter: 273 mm (10.75 in)
Active Surface Area: 0.038 m² (0.41 ft²)
Dry Weight: 0.85 kg (1.9 lb)

Design Airflow: 0-16 m³N/h (0-10 scfm)
Overall Diameter: 273 mm (10.75 in)
Active Surface Area: 0.038 m² (0.41 ft²)
Dry Weight: 0.85 kg (1.9 lb)


Gaskets: EPDM
Supports & Anchor Bolts: Stainless steel AISI 304 or 316
Distribution Headers: PVC or CPVC for high temperatures
Laterals: UV-protected PVC, CPVC
Drop Pipes: Stainless steel AISI 304 or 316