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- 3M
- ABiC FLI
- ABS Wastewater Technology Ltd
- AC Plastic Developments Ltd
- Access Design & Engineering
- Achromatic
- ACO Technologies plc
- ACWa Air
- ACWA Services Ltd
- Adams Hendry Consulting Ltd
- Advanced Aeration Ltd
- Advanced Building Composites Ltd
- Advanced Engineering Solutions Limited
- Advantage Controls (Europe) Ltd
- AECOM
- Aerzen Machines Ltd*
- Agrico Engineering Sales Ltd
- Air-Water Treatments Ltd
- Albion Water Structures Ltd
- Alfa Laval Ltd
- ALLU UK Ltd
- Alton Pumps Ltd
- Analytical Technology
- Andrews Sykes Group Plc*
- Andritz Ltd
- Anglo Technical Recruitment Ltd
- Angus Flexible Pipelines
- Ant Hire Ltd
- Anton Paar Ltd
- APEM Ltd
- Applied Ionics Ltd
- Aqua Enviro Technology Transfer
- Aqua Water Systems Ltd
- Aquacast (Fabrications) Ltd
- Aquaco Ltd
- Aquamatic Ltd
- Aquarius Marine Group Ltd
- Aquasentry
- Aquasystems International
- Aquatic Control Engineering Ltd
- Aquavent UK Ltd
- Armitage Communications
- Arup Group Ltd
- Ashbrook Simon-Hartley Ltd
- Ashworth Supplies Ltd
- Astell Scientific Ltd
- Atlas Copco Ltd
- AUMA Actuators Limited
- Avista Technologies (UK) Ltd
- AVK UK Ltd
- Axium Process Limited
- Börger UK Limited
- Balcan Engineering Ltd
- Barnfield Engineering Services Ltd
- Bedford Pumps Ltd
- BEKA Associates Ltd
- Bell Flow Systems Ltd
- Belzona Polymerics Ltd
- BGB Engineering Ltd
- Bilco UK Ltd
- Black & Veatch Ltd
- Blackhall Engineering Ltd
- Bonomi (UK) Ltd
- Bradney Chain & Engineering Co. Ltd
- Brauer Ltd
- British Flora
- British Water*
- Bronkhorst (UK) Ltd
- BSS Group PLC
- Burmarc Environmental Ltd
- Butyl Products Ltd
- C & G Services (Europe) Ltd
- Cable Detection Ltd
- Cablofil UK Ltd
- Calmag Ltd
- Camlab Ltd*
- Camlock Systems Ltd
- Caprari Pumps (UK) Ltd
- Capula Limited
- Carrier Rental Systems UK Ltd
- Castell Safety International Ltd
- Castings Services Ltd
- Celtic Vacuum Ltd
- Centa Transmissions Ltd
- Certikin International Ltd
- Charles Austen Pumps Ltd
- Chelsea Technologies Group Ltd
- Chem Resist Group Ltd
- Chemical Reactor Services
- Chemical Support Systems Ltd
- Chemviron Carbon Ltd
- Chesterfield BioGas Ltd
- Churchill Controls*
- CIRIA
- Cirrus Scotland Ltd
- CIWEM
- Clancy Docwra Ltd
- Clayton IWT Ltd
- Cleansing Service Group Ltd
- Cleeve Materials Handling Ltd
- Cleveland Biotech Ltd
- Clippertech Ltd
- CMT Flexibles Ltd
- Coating & Lining Applications Ltd
- Cole Parmer Instrument Company
- Combidrive Ltd
- Comid Engineering Ltd
- Concrete Pipeline Systems Association*
- Concrete Repair Association
- Conder Solutions Ltd
- Control Techniques Ltd
- Corgin Ltd
- Cougar Coatings Waste - Water Division
- Coulton Instrumentation Ltd
- CPM Group Ltd
- Crowder Consulting
- CSO Technik Ltd
- CSols Ltd
- CST Industries (UK) Ltd
- CTM Systems Limited
- D.C. White & Partners Ltd
- D.R. Pumps Ltd
- Danfoss Ltd
- DaRo UV Systems
- Davies Greenwood Ltd
- Decksafe Solutions Ltd
- Derek Parnaby Cyclones International Ltd
- Deritend Group Ltd
- Desal Supplies
- Detectronic Ltd
- DH Stainless Ltd
- Diehl Metering S.A.S.*
- Dionex (UK) Ltd
- DKK-TOA Corporation
- Draeger Safety UK Ltd
- Drain Center - Wolseley UK
- Drain Serve
- Drain World Ltd
- Drayton Tank & Accessories Ltd
- Dresser Roots
- Drilcorp Ltd
- Drive Systems Ltd
- Dryden Aqua Ltd
- Dual Pumps Limited
- Dustacco Engineering Ltd
- Dwyer Instruments Ltd
- e-RPM Ltd
- Ebro Valves Ltd
- EC Hopkins Ltd
- ECS Engineering Services Ltd
- EDI Europe
- Electrosteel Castings (UK) Ltd
- Eliquo Hydrok Ltd*
- Elster Metering Ltd
- Eltherm UK Ltd
- emi Engineering (SCUDA) Services
- EMS Industries
- Endress + Hauser Ltd
- Energy Chemical & Equipment Company
- ENSO International Ltd
- Enterprise Q Ltd
- Enviromontel Limited
- Environmental Construction Solutions Ltd
- Environmental Innovations Ltd
- Environmental Products and Services Ltd
- Environmental Treatment Concepts
- Environmental Water Systems (UK) Ltd
- Envitech Ltd
- Epco Plastics Ltd
- ESCO International
- ESPA Pumps (UK) Ltd
- ESR Technology Ltd
- Etatron GB Ltd
- ETI Ltd
- Euroby Ltd*
- European Geophysical Services Ltd
- Everyvalve Ltd
- Excel Commissioning Services
- Express Valve Services Ltd
- FACTA
- Festo Ltd
- Field Systems Designs Ltd
- Fileder Filter Systems Ltd
- Filtec Water Services Ltd
- Filter Clear Ltd
- First Water UK Ltd
- Flexseal Couplings Ltd
- Flo-Dyne Controls (UK) Ltd
- Flood Guards Systems Ltd
- Floodgate Limited
- Flotech Solutions Ltd
- Flowline Manufacturing Ltd
- FlowMarque Ltd
- Flowplant Group
- Forbes Technologies Ltd
- FP McCann
- FPZ UK Ltd
- Franklin Hodge Industries Ltd
- FT Pipeline Systems Ltd
- FWB Products
- G A Valves Ltd
- Gaffey Technical Services Ltd
- Galglass
- Garside Sands
- Gas Measurement Instruments Ltd
- Gast Group
- GEE & Company
- Gemini Data Loggers (UK) Ltd
- Gems Sensors & Controls
- Geoquip Water Solutions Ltd
- George Fischer Sales Ltd
- Geotechnical Instruments (UK) Ltd
- Gilson Scientific Ltd
- GL Industrial Services
- Glenfield Valves Ltd
- GPS PE Pipe Systems
- Grontmij
- Group Four Glassfibre Co Ltd
- Haigh Engineering Company Ltd
- Haith Industrial
- Hanovia Ltd
- Hawker Electronics Ltd
- Hayes Plastics Engineering
- Henkel Limited
- Hepworth Building Products Ltd
- Herbert Smith LLP
- Hermes Technologie Ltd
- Hidrostal Ltd
- Howlett Associates Water Treatment Ltd
- HPC plc
- HRS Heat Exchangers Ltd
- Huber Technology UK*
- Huntingdon Pump Co Ltd
- Hutchinson Environmental Solutions
- Hyder Consulting (UK) Ltd
- Hydra-Valve Ltd
- Hydrascan
- Hydro International
- Hydro Nova Europe Ltd
- Hydro-Logic Ltd
- Hydroline Solutions Ltd
- Hydropath Holdings Ltd
- Hygrade Industrial Plastics Ltd
- I.I.E.S Northern Ltd
- icenta Controls Ltd
- ICONICS UK Ltd
- IETG Ltd
- ifm Electronics Ltd
- Impact IM Ltd
- Impress Sensors & Systems Ltd
- Imtech Process Ltd
- Industrial Blower Services Ltd
- Industrial Brushware Ltd
- Industrial Purification Systems Ltd
- Information and Performance Services Ltd
- Infotec Consulting
- Initiative
- Innovyze
- Instarmac Group plc
- Intellitect Water Ltd
- Interserve Construction Ltd
- IPS Flow Systems Ltd
- J Fletcher (Engineering) Ltd
- J Murphy & Sons Ltd
- JA Envirotanks
- JB Wheaton & Sons Ltd
- Jestim Ltd
- Jetmasters Ltd
- JFC Mfg (Europe) Ltd
- John Crane UK Ltd
- John Guest Ltd
- Judd Ltd
- JWC International
- Kamco Ltd
- Karis Technical Services Ltd
- Katronic Technologies Ltd
- Kebrell Nuts & Bolts Ltd*
- KEE Process Ltd
- Keller (UK) Ltd
- Kemada Limited
- Kestrel Environmental Ltd
- KGN Pillinger
- Kidde Products Ltd
- Kijlstra LTD
- King Tanktechnic Ltd
- Kingsbridge Risk Solutions
- Kingsley Plastics Ltd
- Kirk Environmental Ltd
- KK Water Purification Ltd
- Kleiber UK Ltd
- Kobus Services Ltd
- Koch Chemical Technology Group Ltd
- Krohne Ltd
- Labman Automation Limited
- Lafert Electric Motors Ltd
- Lambda Advanced Technology Ltd
- Landia UK Ltd
- Lanes For Drains Ltd
- Ledbury Welding & Engineering Ltd
- Lhoist UK
- Lincoln Security
- LINPAC Allibert Ltd
- Lintott Control Systems Ltd
- Liquid Metering Instruments Ltd
- Liquivault Ltd
- Lutz-Jesco (GB) Ltd*
- Maris Pumps Ltd
- Marley Plumbing & Drainage
- Marsh Industries Ltd
- Marshalls plc
- Masternaut UK Ltd
- Matchtech Group plc
- Mayr Transmissions Ltd
- Melcourt Industries Ltd
- Merrow Language Recruitment
- Metrohm UK Ltd
- Mettler-Toledo Ltd
- Micronics Ltd
- Midland Water Systems Ltd
- Mineral Supplies International Ltd
- Mini-Cam Ltd
- Mitras Composites (UK) Ltd
- Mitsubishi Electric*
- MK Pumps & Motors Ltd
- Modern Water plc
- Mono Pumps Ltd
- Monsal Ltd
- Morgan Lang Limited
- Morris Site Machinery
- Mott MacDonald Limited
- MSA Engineering Systems Ltd
- MSE Hiller Ltd
- Multisensor Systems Ltd
- MultiTrode UK
- Murray Control Systems Ltd
- MV Fluids Handling
- MWH Treatment Ltd
- Naylor Industries PLC
- NCIMB Limited
- Neoperl UK Limited
- Netzsch Pumps Ltd
- Newcastle University
- Nicholson Plastics Ltd
- Nitto Kohki Europe Co. Ltd
- Nivus U.K.
- NORD Gears Ltd
- North Eastern Composites Ltd
- North Ridge Pumps*
- Northey Technologies Ltd
- Oaklands Plastics Ltd
- OLAER Fawcett Christie Ltd
- Oliver IGD Ltd
- Ondeo Industrial Solutions
- Orbinox (UK) Ltd
- OTT Hydrometry Ltd
- P & M Pumps
- P & R Labpak Ltd
- P.F. Copeland Ltd
- Palintest Ltd
- Pall Europe Ltd
- Pall Ring Company Ltd
- Palmer Environmental
- Panton McLeod Ltd
- Paragon Parts Ltd
- PCL Control Instruments Ltd
- PCM Pumps Ltd
- Penna Barkers
- Phoenix Contact Ltd
- Phoenix Mecano Ltd
- Pipeline Industries Guild
- Pipeline Technology Ltd
- Pipex Ltd
- Plascoat Systems Ltd
- Plasson UK Ltd
- Plenty Filters
- PMP Ltd
- PNR UK Ltd
- Pollution & Process Monitoring Ltd
- Pollution Monitors Ltd
- Polypipe Civils
- Portasilo Ltd
- Power Plastics Ltd
- Precolor Sales Ltd
- Premier Coatings Ltd
- Pressvess Ltd
- Prisma Services Ltd
- Process Instruments (UK) Ltd
- Process Measurement & Analysis Ltd
- Prochem Services Ltd
- Production Glassfibre Ltd
- Prominent Fluid Controls*
- Pruce Newman Pipework Ltd
- Pulsar Process Measurement Ltd*
- Pump Supplies Ltd
- Quadrachem Laboratories Ltd
- Quantum Engineering Developments Ltd
- R2M Ltd
- Radio Data Networks Ltd
- Radiodetection Ltd
- Radius Systems Limited
- RainWater Harvesting Ltd
- Ram Services Limited
- RCF Bolt & Nut (Tipton) Ltd
- RDT Chamber Solutions
- Reagecon Analytical Ltd
- Regal Tanks
- Resource Chemical Ltd
- Resourcebank Recruitment Ltd
- Rewatec Ltd
- Roto Pumps Ltd
- Rotorflush Filters
- RPS Water Services
- RS Hydro Ltd
- Russetts Developments Ltd
- Safeguard Europe Ltd
- Saint-Gobain PAM UK
- Salt Separation Services Ltd
- Samatrix Ltd
- Saxlund International Ltd
- Saxon Water
- Schwer Fittings Ltd
- SEAMS Ltd
- Seba KMT UK
- seepex UK Ltd
- Seko UK Ltd
- Sembcorp Utilities Services Ltd
- Sensonics Ltd
- sera Dosing UK Ltd
- Sesys Ltd
- SEW Eurodrive Ltd
- Sewerin Ltd
- SH + E Ltd
- Sharp Site Services Ltd
- Showers & Eyebaths Services Ltd
- Silotank
- Silsoe Odours Ltd
- Sira Test & Certification Ltd
- Sirco Controls Ltd
- Siris Environmental Ltd
- SKE Solutions Ltd
- SLD Pumps and Power
- Sortimo International Ltd
- Sovereign Capital
- Spaans Babcock Ltd
- SPEL Products
- Spirac Ltd
- Stafford Long & Partners Limited
- Stainless Metric Stock Ltd
- Stanton Bonna Concrete Ltd
- Statiflo International Ltd
- Steelway*
- Steelway Brickhouse*
- Stem Drive Ltd
- Sterner Aquatech UK
- Steve Vick International Ltd
- Stirling Technical Engineering Ltd
- Stonbury Ltd
- Stormsaver Ltd
- Straight Plc
- Streamline Measurement Ltd
- Superior Filtration Ltd
- Surespan Limited
- SVR Plastics Ltd
- SWAN ANALYTICAL UK Ltd.
- SWIG Sensors for Water Interest Group*
- Synbiosis
- Technocover Ltd
- Teekay Couplings Ltd
- Thames Water Utilities Ltd
- The Fluid Group
- The IET
- Thermo Fisher Scientific
- Total Lockout (Safety) Ltd
- Total Protection (UK) Limited
- Trant Construction Ltd
- Trilogy Group
- TrojanUV Technologies UK Limited
- Trolex Ltd
- Tubosider UK Ltd
- Tynemarch Systems Engineering Ltd
- U-Mole Ltd
- UKPipelines.com Ltd
- UVO3 Ltd
- Vacon Drives (UK) Ltd
- VAG Valves UK Ltd
- Valeport Ltd
- VEGA Controls Ltd
- Veolia Water Solutions & Technologies*
- Verder (UK) Ltd
- Vernon Morris & Co Ltd
- Vogelsang Ltd
- Vulcan Industrial Fasteners Ltd
- Wachs UK
- Warden Plastics Ltd
- Water Active Directory*
- Water Direct Management Ltd
- Water Management Society
- Water Treatment Products
- WaterAid*
- Waterco Europe Ltd
- Waterflow Plc
- Watling Hope
- Watson-Marlow Pumps
- Wavin Ltd
- Weidmuller Ltd
- WES Ltd
- Wessex Chemical Factors
- Whisper Pumps Ltd
- WILO (U.K.) Ltd
- Winn & Coales (Denso) Ltd
- Wood & Douglas Limited
- Woodford Plastics Ltd
- Wrekin Products Ltd
- Wymark Ltd
- Xylem Analytics UK Ltd*
- Yara UK Ltd
- Z-Tech Control Systems Ltd
- Zoedale Plc
