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Energy Recovery designs, develops, and manufactures energy recovery devices used in sea water reverse osmosis (SWRO) desalination plants. The SWRO process is energy intensive, using high pressure to drive salt water through membranes to produce fresh water. The company's main product, the PX Pressure Exchanger, helps recapture and recycle up to 98% of the energy available in the high-pressure reject stream, a by-product of the SWRO process. The PX can reduce the energy consumption of a desalination plant by up to 60% compared with a plant lacking an energy recovery device. Subsidiary Pump Engineering also makes high pressure pumps.

Euro Tech Holdings distributes laboratory instruments, analyzers, test kits, and other equipment for water and wastewater treatment throughout Hong Kong and China. Offering equipment from both Asian and Western suppliers, Euro Tech also distributes telecommunications and general testing equipment, and provides technology services to government agencies, utilities, and beverage makers. The company has more than 1,000 customers, including the Hong Kong Environmental Protection Department and China Light & Power. Nearly all of the company's business is in China.

Fuel Tech, Inc. sells its NOxOUT brand of products, equipped with a retrofittable system, for the reduction of nitrogen oxide in boilers, incinerators, furnaces, and other combustion sources. Fuel Tech's NOx reduction technologies are installed worldwide on more than 450 combustion units, including utility, industrial and municipal solid waste applications. The air pollution control company also makes FUEL CHEM to reduce slag formation and corrosion in boilers and furnaces. Chairman Ralph Bailey and son Douglas Bailey, a director, together own almost 25% of Fuel Tech.

MFRI makes piping systems, air filter elements, and industrial process coolant systems (liquid chillers) and HVAC systems through subsidiaries Perma-Pipe, Midwesco Filter, Thermal Care, and Midwesco Mechanical, respectively. Perma-Pipe's specialty piping systems are used on college campuses, military bases, and other large sites. Midwesco provides products and services for industrial air filtration, while Thermal Care's heat transfer equipment is used primarily by the plastics industry. Midwesco Mechanical provides HVAC systems for nonresidential projects. The US accounts for the bulk of MFRI's revenue.

N-Viro International Corporation develops and licenses its technology to municipalities and private companies. Their patented processes use lime and/or mineral-rich, combustion byproducts to treat, pasteurize, immobilize and convert wastewater sludge and other bio-organic wastes into biomineral agricultural and soil-enrichment products with real market value. The company has generated sales in excess of $40 million dollars, since its initial public offering in October of 1993, which was underwritten by Robertson Stephens, Raymond James, Oppenheimer & Co., and Paine Webber.

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