Press Release

Hyde GUARDIAN® is First Ballast Water Treatment System to Be Awarded Type Approval by the Russian Maritime Register of Shipping

PITTSBURGH, PA  –  05/19/2011

Calgon Carbon Corporation’s (NYSE: CCC) wholly owned subsidiary, Hyde Marine, Inc., announced today that its Hyde GUARDIAN® has become the first ballast water treatment (BWT) system to be awarded Type Approval from the Russian Maritime Register of Shipping (RMRS).

As a result of the RMRS Type Approval, which is effective immediately, Hyde GUARDIAN® units may be installed on any Russian-flagged vessel. The RMRS Type Approval was granted for the entire range of Hyde GUARDIAN® systems with treatment capacities from 60 m3/hr to 6000 m3/hr. A Hyde GUARDIAN® unit is scheduled for installation on the Russian arctic container vessel, the MS Norilskiy Nickel, in late summer of 2011 and will have a treatment capacity of 250 m3/hr.

In commenting on the RMRS approval, James A. Sullivan, vice president of Calgon Carbon, said, “Achieving RMRS approval is another example of Calgon Carbon’s ongoing commitment to provide the maritime industry with the leading ballast water treatment systems anywhere in the world.”

Hyde GUARDIAN® systems are chemical free, using filtration and ultraviolet disinfection to treat ships’ ballast water to prevent the spread of aquatic invasive species from port to port. The Hyde GUARDIAN® unit received International Maritime Organization (IMO) Type Approval in April 2009.

Hyde Marine will join its Russian Distributor MARCON-West Ltd. in booth number R4139 at NEVA-2011. The maritime exhibition runs September 20-23, 2011, LENEXPO, St. Petersburg, Russia.

Hyde Marine is a recent addition to Calgon Carbon’s Ultraviolet Technologies Division and is a global leader in the growing BWT market. Hyde Marine has sold more than 100 Type Approved systems to date. For more information about the Hyde GUARDIAN®, visit www.hydemarine.com.

About Calgon Carbon Corporation
Calgon Carbon, headquartered in Pittsburgh, Pennsylvania, is a global leader in services and solutions for making water and air safer and cleaner. For more information about Calgon Carbon’s leading activated carbon and ultraviolet technology solutions for municipalities and industries, visit dev.calgoncarbon.com.

About Russian Maritime Register of Shipping
Established in 1913, Russian Maritime Register of Shipping (RS) is one of the leading classification societies. It is recognized by the European Union and is a member of the International Association of Classification Societies. The RS is aimed at enhancement of the maritime safety high standards and minimizing the negative impact of human activities on the environment through scientifically based risk assessment and risk management procedures (www.rs-class.org).

Calgon Carbon Corporation, headquartered in Pittsburgh, Pennsylvania, is a global leader in services and solutions for making water and air safer and cleaner. This news release contains historical information and forward-looking statements. Forward-looking statements typically contain words such as “expect,” “believe,” “estimate,” “anticipate,” or similar words indicating that future outcomes are uncertain. Statements looking forward in time, including statements regarding future growth and profitability, price increases, cost savings, broader product lines, enhanced competitive posture and acquisitions, are included in the company’s most recent Annual Report pursuant to the “safe harbor” provision of the Private Securities Litigation Reform Act of 1995. They involve known and unknown risks and uncertainties that may cause the company’s actual results in future periods to be materially different from any future performance suggested herein. Further, the company operates in an industry sector where securities values may be volatile and may be influenced by economic and other factors beyond the company’s control. Some of the factors that could affect future performance of the company are higher energy and raw material costs, costs of imports and related tariffs, labor relations, availability of capital and environmental requirements as they relate both to our operations and to our customers, changes in foreign currency exchange rates, borrowing restrictions, validity of patents and other intellectual property, and pension costs. In the context of the forward-looking information provided in this news release, please refer to the discussions of risk factors and other information detailed in, as well as the other information contained in the company’s most recent Annual Report.