- American Biosystems,Inc.
 - Producer of microbial enzyme products for feed ingredients, aquaculture cultures, and municipal, agricultural, and industrial waste treatment. - Aqua Blue
- Offers a complete line of drinking water filtration products, reverse osmosis purification systems, residential and commercial filters, softeners, bottles, coolers, and more.
- Aqua Care Systems
- Designs and manufactures water, wastewater, and liquid processing systems for residential, commercial, industrial, and municipal customers.
- Aqua Pure Water Conditioning
- Supplier of residential, commercial, medical, and ultra pure water treatment products.
- Aquakimia
- Supplies chemicals, plants and systems, and equipment for industrial and waste water treatment.
- Baker Monitor Manufacturing
- Manufactures submersible water pumps, booster stations, and industrial pitless units that are both economical and eco friendly.
- Burt Process Equipment, Inc.
- Offers pH neutralization, pumpstations, tanks, and more.
- Carbtrol Corporation
- A manufacturer of air, wastewater, and groundwater and soil contamination filtration and extraction equipment.
- Chemical Injection Technologies, Inc.
- Direct cylinder mounting gas chlorinators and sulphonators.
- Chieh Sheng Co.
- Taiwan-based company specialising in the production of R.O. water purifier systems, cooling equipment, and domestic house appliances .
- Contamination Control Technologies Ltd
- Supplying a wide range of water treatment and filtration systems for commercial, industrial and municipal users.
- Conzepte Technik Umwelt (CTU)
- Engineering company active in incineration, gas cleaning, and residue treatment.
- Cordonna Associates, Inc.
- Sells water treatment systems including water softeners, reverse osmosis systems, ultraviolet disinfection units, water purifiers, water filters,and more.
- D.M. Anderson Company
- Manufactures represenative for water and waste water monitoring and control equipment.
- Dean Bennett Supply Company
- Distributes Zoeller pumps and well supplies.
 Derwent Water Systems Limited
- Manufacturers and suppliers of water treatment plant spares and equipment.- Earth Resources
- Designs and distributes water treatment, filtration, and analytical monitoring and laboratory equipment in Central and Eastern Europe.
- Ecodyne Ltd
- Furnishing systems and equipment worldwide for the water and wastewater treatment industries.
- Electrochemical Design Associates
- Specialising in electro-chemical/biological process systems for water, wastewater, effluent, resource-recovery and groundwater treatments for industrial, commercial and residential usage.
- Global Treat, Inc.
- Provider of gas, liquid, and solid feed chlorination, dechlorination, and ammoniation systems for municipal, industrial, and commercial water and waste water treatment
- Graver Water
- Designs, engineers and manufactures water and wastewater treatment equipment and systems for industrial plants and electric utilities.
- HanSu
- Offering water and wastewater treatment chemicals and automation devices.
- Hawkins & Associates
- Supplies chemical metering pumps, controllers, flow meters, tanks, and accessories; applications include boiler blowdown systems, cooling tower and waste water treatment systems.
- Industrial Screen Products
- Offers custom engineered wedgewire screen products and screening equipment for liquid and solid separation.
 Industrial Water Equipment
- Supplier of water treatment equipment and spares to pharmaceutical, microelectronic, food and beverage, automotive, and chemical industries. Based in Dublin, Ireland.- Industrial Water Equipment
- Offers water treatment equipment, including reverse osmosis, water softeners, filtration, effluent treatment, and more.
- Infilco Degremont Inc.
- Producer of water and wastewater systems including, filters, softeners, and biological treatment.
- J.L. Wingert Company
- Water, wastewater, and process water treatment equipment specialists.
- Krudico, Inc.
- Provides commercial, industrial, and small municipal water treatment.
- Layne Christensen Company Water Treatment Division
- Provides medium to large scale water treatment equipment ranging from individual unit processes to interconnecting piping, auxiliary equipment, instrumentation and controls.
- LifeSource Water Systems, Inc.
- Specialises in water filters, water softeners, and water treatment.
- MD Instruments Ltd.
- Water quality monitoring and control instrumentation systems.
- MECO
- Design and manufacture of desalination equipment, industrial purification plants, pharmaceutical distillation units, pure steam generators, marine heat exchangers and pumps.
- Metre-General, Inc.
- Makers of Octolig, a commercial technology that utilizes immobilized ligands for heavy metal removal from water.
- Milieu-Nomics Incorporated
- Manufacturer of water and wastewater treatment products including those used for water purification, industrial wastewater, and oil water separation.
- NEFCO, Inc.
- Manufacturer of fibreglass products, density current baffles and launder covers for the water and wastewater industries.
- Niro Process Technology
- Supplier of freeze concentration, melt crystallization, wash column separation, and chemical purification technologies.
- Phoenix-Global
- Resale and distribution of water and air purification products for commercial, industrial, and residential application.
- Pollution Control HQ: Water Treatment
- Equipment and systems to purify and treat wastewater.
- Premiere Sales Water Systems
- Online source for professional grade GE water filtration systems, softeners, coolers, whole house water systems, and replacement filters. Premiere Sales provides systems to the residential, commercial, and food service markets.
- Pumps and Controls, Inc.
- Water treatment equipment.
- Pure Aqua
- Offers water treatment and commercial water purification systems.
- R&M Manufacturing, Inc.
- Maker of commercial, industrial, and residential water conditioning and reverse osmosis systems and components.
- R.L.M. Benelux BV
- Manufacturers of heat pumps, boilers, storage tanks, water treatment equipment, and more.
- Ropur AG
- Offers reverse osmosis and microfiltration elements and equipment, including desalination membranes, chemicals, pressure vessels and more.
- ROwater Systems, Inc
- offers products and services for the water treatment industry.
- Russell Mainstream Supply Ltd.
- Russell Mainstream Supply provides an extensive range of instruments that can increase the efficiency of process control. These instruments can measure dissolved oxygen, conductivity, temperature, and turbidity accurately and easily.
- Sanders Company, Inc.
- Offers a complete line of equipment and services in the water and wastewater treatment markets.
- Sanitherm Engineering Limited
- Manufacturer & supplier of water and wastewater treatment equipment. Designing, building and operating sewage treatment plants.
- Siemens Water Technologies
- Water and wastewater treatment systems, services, and equipment for industrial, municipal, aquatic, and laboratory applications.
- Sindico Ltd
- Specialists in water and wastewater treatment. Serving Australasia.
- Smith and Loveless
- Equipment for pumping, water treatment and wastewater treatment.
- Spartan Environmental Technologies
- Ozone generators and advanced oxidation processes for industrial and municipal wastewater treatment.
- Sterling Hydrotech Ltd
- Water treatment plant manufacturing and service.
- Tampa Bay Water Conditioning
- Manufactures and distributes filtration equipment for drinking and well water purification and swimming pool chlorination to remove bacteria, tannins, tanic acid, and sand.
- Tower Company, The
- Makers of water towers for the camp site industry, sewer covers, and dumping station supplies.
- Tracom, Inc.
- Fibreglass products for the water and wastewater industries, including: flumes, packaged metering manholes, buildings, filter/instrument consoles, and enclosures.
- Triwin Watertec Co.
- Manufacturer of water treatment equipment, including reverse osmosis systems and accessories, water purifiers and softeners, filtration systems, water dispensers, booster pumps, and more.
- Tropodyne Corp.
- Manufactures water and waste water clarifying equipment.
- USA Bluebook
- Distributor of water and wastewater treatment equipment.
- Water Systems Treatment Specialists Ltd.
- Commercial, industrial, rural and domestic water and effluent treatment specialists for the Australasian market.
- Water Treatment and Controls Company
- Distributor for Wallace & Tiernan Equipment parts and accessiories for Georgia, Florida and Alabama.
- Water Treatment Store, The
- Offering water treatment chemicals, equipment, and test kits for industrial/commercial, pool/spa, and water softener operations.
- Water Treatment Supply
- Distributor of water treatment equipment in the U.S. including chemical metering pumps, controllers, tanks, mixers, and more.
- Wincross Water Services, Inc.
- Offering purification, filtration, and treatment products and services.
- Zenon Environmental Inc.
- Develops and manufactures membrane technologies for water treatment, wastewater treatment, and water reuse.
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