• Aeratos Inc.

• Aervoe Industries Incorporated

• Alfa Laval Inc.

• Alpha Water Conditioning Co.

• American Carrier Equipment Inc.

• American Delphi Inc.

• Ametek

• Amtrol

• Amwell

• Anderson 2000 Inc

• Anderson Chemical Co.

• Anderson Water Systems Ltd.

• Aqua-Chem

• Aqua-Flo

• Associated Fiberglass Enterprises

• Augusta Fiberglass

• B&L Fence

• B. I. Industries

• BOC Gases

• BVS Concrete Specialties

• Badger Meter

• Beaumont Sign Company

• Belco Mfg. Co.

• Bete Fog Nozzle

• Bingham Enterprises

• Bio-Microbics, Inc.

• Blue Sky Landscape Services, Inc.

• Bord na Mona

• Bruner Water Treatment Systems

• Capital Controls Company Inc.

• Carbtrol Corporation

• Cascade Pump Company

• Charles Ramm Associates

• Cla-Val Co.

• Colonial Brass Co.

• Composite Structures, Inc.

• Construction Design Technologies

• Croll-Reynolds Co.

• Crystal Fountains

• Culligan International

• Cuno

• DLM Plastics Corp.

• Del Industries

• Devar, Inc.

• DiCicco Contracting Co.

• Diamond Water Systems

• EIMCO Process Equipment Co.

• Ecocast Ltd

• Ecocreto of Texas

• Ecodyne Ltd.

• Ecodyne Water Treatment

• Engelhard Corporation

• Environment/One Corp.

• F. P. Smith Wire Cloth Co.

• FE Myers

• FSD

• Facet International

• Farr Associates

• Ferro Corp.

• Filter Specialists, Inc.

• Filtronics, Inc.

• Finnan Engineered Products Ltd.

• Flint & Walling, Inc.

• Franklin Miller

• Freedom Plastics, Inc.

• Glenridge Equipment Corporation

• Global Equipment Marketing, Inc.

• Goodnature Products

• Gorman-Rupp Company

• Grace Dearborn Inc.

• Granco Pump

• Gravity Flow Systems

• Hempfield Foundries Co.

• Highland Tank & Mfg. Co.

• Hoffman Air & Filtration Systems

• Hotsy Corp.

• Hydroworks, LLC

• ISCO

• Idealco Inc.

• Industrial Filter & Pump Mfg. Co.

• Invincible Air Flow Systems

• J W I

• J.D. Gould Company, Inc.

• J.L. Turner Co.

• JC Cleaning Contractors Inc.

• JWC Environmental

• Kaeser Compressors

• Kahl Scientific Instrument Corporation

• Kemco Systems

• Keystone Filter Division

• Kinetico

• Komline-Sanderson Ltd

• Kunkle Valves

• LIGHTIN

• Larson Design Group, Inc.

• Lignum

• Link-O-Matic Mfg. Co.

• Log Cabin Siding

• MAGNAFLUX

• Magnor Inc.

• Melrose Chemicals Ltd.

• Millipore

• Mueller Canada Inc.

• NEOPERL

• Nash Engineering

• National Conveyors Company, Inc.

• Neptune Chemical Pump Co.

• Nicholson Steam Trap

• Nordic Systems

• Northstar Water Conditioning

• Nu-Calgon Wholesaler

• ONDEO Nalco Company

• Oakite Products of Canada Ltd.

• Obermeyer Hydro

• Ondeo Degremont, Inc.

• Osmonics

• PCI-Wedeco Environmental Technologies

• PFT of America

• Paddock Pool Equipment Co., Inc.

• Parkson Corporation

• Patterson Pump Co.

• Peerless Painting Co. Inc.

• Penn Separator Corp.

• Philadelphia Mixers

• Plast-O-Matic Valves

• Plastronics

• Pneumercator Co.

• Power Plant Supply Company

• Precise Forms Inc.

• Precision Painting Co

• Pure Water, Inc.

• Pyramid Precast Company Inc.

• Qual Tech Enterprises

• Quatic Industries

• R-Can Environmental Inc.

• R. P. Adams Co., Inc.

• Rebecca Schunck Wallpaper Installation and Removal

• Roark Construction, Inc.

• Roediger Pittsburg

• SERFILCO

• SJE/Rhombus

• SMRT, Inc.

• Scienco/Fast Systems

• Select Engineered Systems

• Smith & Loveless

• Somat Company

• Spartan Mfg.

• Spence Engrg. Co.

• Spencer Turbine Co.

• Spirax Sarco, Inc.

• Spirotherm

• Sportmaster

• Stark Products

• Stormwater Management

• Superior Manufacturing Division

• Swenson Process Equipment Inc.

• Taylor Technologies

• Temprite Co.

• The Leavitt Machine Company

• The Pentair Pump Group, Inc. (F.E.Myers)

• Time Mark Corporation

• Townsend Associates

• Tri-River Design & Construction, Inc.

• Tyler Pipe

• U.S. Filter

• U.S. Filter Microfloc Products

• U.S. Filter/Stranco

• URS Corporation

• USFilter - Wallace & Tiernan Products

• United States Filter Corp.

• Vanton Pump & Equipment Corp.

• Vaponics/Osmonics

• Victaulic Co. of America

• WASTECORP

• WASTECORP. PUMPS

• WESCO Distribution Inc.

• Walker Process Equipment

• Warminster Fiberglass

• Waterloo Biofilter Systems

• Waterman Industries

• Watson-Marlow Bredel Inc

• Westering Design

• Yardney Water Management Systems