• AMPM Environmental Inc.

• AXEON Water Technologies

• Aeratos Inc.

• Aqua-Aerobic Systems

• Bio-Microbics, Inc.

• Bord na Mona

• CETCO

• F. B. Leopold Co.

• Gravity Flow Systems

• J W I

• Purestream

• Scienco/Fast Systems

• U.S. Filter

• U.S. Filter/Stranco

• United States Filter Corp.

• Waterloo Biofilter Systems