• Anderson Water Systems Ltd.

• Aqua-Aerobic Systems

• Aquatic Development Group, Inc.

• CETCO

• Celite Corp.

• Construction Design Technologies

• Diamond Water Systems

• Ditech Communications

• ECO Corp.

• EIMCO Process Equipment Co.

• F. B. Leopold Co.

• F. P. Smith Wire Cloth Co.

• Ferro Corp.

• Filter Specialists, Inc.

• Filtronics, Inc.

• LINQ Industrial Fabrics

• Larson Design Group, Inc.

• Leer Electric Inc.

• Natare Corporation

• Neptune-Benson

• Newark Wire Cloth Co.

• Peerless Painting Co. Inc.

• Quickway Metal Fabricators

• Townsend Associates

• U.S. Filter

• U.S. Filter Microfloc Products

• United States Filter Corp.

• Westering Design