New Jersey DEP approves use of Hydro International filter in stormwater treatment projects

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• Regulator's move follows independent performance verification in November 2008

PORTLAND, ME, Dec. 16, 2009 -- Hydro International, a leading provider of environmentally sustainable products and innovative solutions that control and treat stormwater, wastewater and combined sewer overflow, today announced that the New Jersey Department of Environmental Protection (NJDEP) has approved the use of Hydro Up-Flo® Filter, an advanced stormwater filtration device, in New Jersey stormwater treatment projects.

The New Jersey DEP approved the use of the Up-Flo Filter following verification by the New Jersey Corporation for Advanced Technology (NJCAT) of the filter's performance capabilities in a rigorous series of tests. While the performance verification by public-private partnership NJCAT indirectly allowed the Up-Flo Filter to be used in several other states, New Jersey regulators required a second review before the product could be used in Garden State projects. For development and redevelopment construction projects in the State of New Jersey, the Up-Flo Filter will now be used on inflow drainage areas of up to 1.8 acres for a 6-module configuration. This represents a maximum drainage area of 0.3 acres per filter module. The 6-module configuration fits into a standard four-foot concrete manhole.

"With today's approval Hydro International and the Up-Flo Filter cross a major milestone," said Larry Abatiell, National Sales Manager of Hydro International's U.S. Stormwater business. "It is widely known that New Jersey's testing procedures and approval processes for stormwater treatment devices are among the most stringent in the nation. We are looking forward to providing the state of New Jersey with high-quality treatment solutions that do the job at an affordable price."

The Up-Flo Filter is a high-rate stormwater filtration technology that removes trash, sediments, nutrients, metals and hydrocarbons from stormwater runoff. As the industry's only fluidized bed upflow filtration technology, the Up-Flo Filter provides a higher level of treatment, a higher rate of filtration, longer life of filter media and a longer maintenance cycle than other filter systems.

The NJDEP's approval follows the Up-Flo Filter's Pilot Use Level Designation in early 2008 by the Washington Department of Ecology, also known for its rigorous performance verification standards.

In November 2008, NJCAT verified that the Up-Flo Filter removes more than 80 percent Total Suspended Solids (TSS) using Hydro-Filter-Sand™ (HFS) media. Laboratory test protocols and equipment were designed to mimic real field installations by using the full-scale commercially available Up-Flo Filter having one to six filter modules housed in a 4-foot-diameter manhole. The testing demonstrated the filter performance based on multiple filter modules operating at peak infiltration rates.

Government and private groups in the state of New Jersey and in many other states consider NJCAT's stamp of approval a critically important credential when determining which equipment to use for stormwater management projects. NJCAT works closely with The Technology Acceptance and Reciprocity Partnership (TARP), formed by eight states to evaluate and share scientific data on technology performance of environmental protection solutions. By sharing data and standardizing testing methods, TARP aims to help agencies streamline approval processes and contractors make informed purchasing decisions. TARP member states are California, Massachusetts, Illinois, Maryland, New York, Pennsylvania, Virginia and New Jersey. Other regions such as the metropolitan areas of Atlanta and Nashville also look to TARP guidelines for guidance on new stormwater management technologies.

About Hydro International
Hydro International plc is a global supplier of environmentally sustainable products and innovative solutions that control and treat stormwater, wastewater and combined sewer overflows, utilizing award-winning advanced vortex and complementary technologies. Hydro International's US Stormwater operation, based in Portland, Maine, is the leading provider of products designed to effectively treat and control the flow of stormwater runoff. Hydro International also has US Wet Weather operations based in Portland, Maine, and the US Wastewater operation based in Hillsboro, Oregon, and has international offices in Dublin, Ireland, and Clevedon and Ely in the U.K. The company is a public company listed on the London Stock Exchange (AIM market ticker: HYD).

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