• ACME Engineering Products

• APV Americas

• Aero Environmental Limited

• Alar Engineering Corporation

• Ammark Corporation

• Aqua Science

• Aqua-Flo

• Aquatic Development Group, Inc.

• Automatic Filters

• B&L Fence

• Blue Sky Landscape Services, Inc.

• Boll Filter Corp.

• Bruner Water Treatment Systems

• Celite Corp.

• Claude Laval Corporation

• Crossman Whitney Griffin PC

• Culligan International

• Cuno

• Del Industries

• Diamond Water Systems

• Ditech Communications

• E. L. Foust Co.

• EIMCO Process Equipment Co.

• Ecodyne Water Treatment

• Elkay Mfg. Co.

• Everpure

• F. P. Smith Wire Cloth Co.

• FSD

• Faber Associates International

• Fantastic Fountains

• Filter Specialists, Inc.

• Filtronics, Inc.

• Flint & Walling, Inc.

• General Ecology

• Halco Products Co. Div.

• Halsey Taylor

• Hydro-Air of Minnesota

• I W Industries

• Industrial Filter & Pump Mfg. Co.

• Infiltrator Systems Inc.

• J W I

• Jacuzzi Canada

• Johns Manville Corp.

• Joseph Davis

• KDI Paragon Aquatics

• Kemco Systems

• Keystone Filter Division

• Kinetico

• Kraissl Co.

• Leer Electric Inc.

• Link-O-Matic Mfg. Co.

• Lobar, Inc.

• McTighe Industries

• Mer-Made Filter

• Met-Pro Corporation

• Noble Trade

• Northstar Water Conditioning

• Nu-Calgon Wholesaler

• O'Donnell Painting Corporation

• Omni Metalcraft Corp.

• Ondeo Degremont, Inc.

• PEM Fountain Company

• Peerless Painting Co. Inc.

• Photo Lab Systems, Inc.

• Pure Water, Inc.

• R. P. Adams Co., Inc.

• Raypak Canada Ltd.

• Recreonics, Inc.

• SERFILCO

• Santa Barbara Control Systems

• Smith & Loveless

• Sparkler Filters

• The Cleveland Wire Cloth & Manufacturing Company

• Tri-River Design & Construction, Inc.

• Trion, Inc.

• U.S. Filter

• U.S. Filter Microfloc Products

• US Filter

• United Industries, Inc.

• United States Filter Corp.

• Vaponics/Osmonics

• Vittitow Refrigeration

• Wadlegger Logging and Construction

• Wolverine Brass

• Woma Corp.

• Woodard Custom Painting, Inc.

• Yardney Water Management Systems

• Ziegler Industries, Inc.