Károly is linked to several environmental technology and methodological developments, patents and procedures.

As CEO he participated in the design and construction of over 150 municipal and industrial wastewater treatment plants, in the evaluation and assessment of thousands of kilometers of public sewer and water supply network, in more than a thousand municipalities.

Károly played a key role in the design and development of the methodology and guide for Central and Eastern Europe, known as the Dynamic Cost Comparison Calculation (DCCC), for selecting least-cost solutions in Water Supply and Sanitation projects, and the development and implementation of life cycle cost based public procurement guide.

His knowledge and expertise were also essential in the development of the Multipurpose Infrastructure Assessment Database (MIAD) software.

As an „ambassador of the value of WATER” and related services, Károly regularly negotiates with professionals, representatives of business, scientific and social sector and participates in 20-30 domestic and international forums annually as speaker, moderator or coach.