42 Computer programming and maintenance of computer software; technical design and planning of water purification plants; designing of machines, apparatus, instruments (including their parts) or systems composed of such machines, apparatus and instruments; design and development of computer hardware; computer software design, computer programming, or maintenance of computer software; computer software design; monitoring of computer systems by remote access; technological advice relating to computers, automobiles and industrial machines; monitoring of water quality; water quality control services; providing computer programs on data networks; cloud computing; software as a service (SaaS); technical design and planning of water pollution control equipment; technical design and planning of water purifying apparatus; technical design and planning of wastewater treatment apparatus, wastewater treatment installations, wastewater purification units or waste water treatment tanks; technical design and planning of air volume control systems, membrane filtration apparatus, and membrane filtration units for water treatment apparatus; repair or maintenance of computer software; energy auditing; consultancy in the field of energy-saving; testing or research on machines, apparatus and instruments; research in the field of artificial intelligence technology; conducting technical project studies; chemistry services