Wallace & Tiernan Products began with the invention of the world's first chlorinator in 1913. W&T pioneered field-disinfection for the U.S. Army and the Red Cross during World War I. International operations began in England in the early 1920s, rapidly expanding to Germany and the rest of Europe.

Today W&T is a truly global operation, with facilities and distributors worldwide. Ninety years after it created the original technology, W&T remains the world leader in disinfecting potable water, wastewater, industrial-process water and swimming pools. The company offers a wide variety of state-of-the-art disinfection solutions: liquid, dry and gas. No supplier can provide a more complete line of equipment for chemical-feed capability, including auger and wire-type feeders,high capacity lime slakers and packaged units, such as polymer-preparation systems.

USFilter Corporation, a Siemens company, delivers cost-effective, reliable water and wastewater treatment systems and services to municipal, industrial, commercial and institutional customers worldwide. It has annual revenues of $1.1 billion, and employs 6,000 worldwide. USFilter is part of Siemens' Industrial Solutions and Services Group (I&S), which provides innovative solutions and services designed to improve competitiveness in processing and manufacturing industries and in infrastructure. In fiscal 2003 (to September 30) I&S employed a total of 25,000 people worldwide and achieved total sales of USD $4 billion (EUR 4.012 billion). Visit company websites at http://www.usfilter.com, and http://www.siemens.com.