Severn Trent Services Provides Reverse Osmosis/Deionization System for Thermal Power Plant in Chile

FORT WASHINGTON, Pa. - April 10, 2008 - A reverse osmosis (RO) system from Severn Trent Services has been selected by Empresa Nacional de Energia S.A. (Endesa Chile), Chile's largest electricity producer, for use at a new thermal power plant in San Isidro, Chile, located in the central region of the country. The system, a three-module UAT(TM) RO filtration system combined with deionization and carbonate systems, is used to provide for effective filtration of process water at the plant and has a filtration capacity of 1,290,000 gallons per day. The new plant is currently in its start-up phase.

Severn Trent Services was represented in the sale by Pro Equipos Ltda., based in Santiago, Chile.

UAT RO systems operate by passing water across an ultra-thin membrane at high pressure. The process can effectively remove more than 97% of all feed water contaminants, including ionic, organic and particulate contamination.

About Severn Trent Services
Severn Trent Services (, with global headquarters in Fort Washington, Pa., USA, is a leading supplier of water and wastewater solutions. The company's broad range of products and services is concentrated around disinfection, instrumentation and filtration technologies, contract operating services and state-of-the-art residential metering products and services. Our analytical services group is the United Kingdom's leading environmental testing organization, and our international operating services business provides worldwide contract operation and support for all aspects of water and wastewater utility operational development and business transformation. Severn Trent Services is a member of the Severn Trent Plc (London: SVT.L) group of companies. Severn Trent is a FTSE 100 company.

Lori Doppelt
+1 215-997-3727

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