Experience in operations drives improvements in design At the heart of TES`s success has been our ability to design and implement projects that offer our client`s life cycle cost benefits. Team building begins with the selection of qualified candidates who undergo training that is as rigorous as our O&M protocols. TES engineers and technicians receive certifications from The Egyptian Water and Wastewater Association (EWWA), and attend international industry conferences and seminars. The goal is to maximize the personal capabilities of our staff and assure the provision of the highest international standards of service and technological expertise.