42 Engineering services in the field of industrial water treatment, wastewater treatment, zero liquid discharge (ZLD) wastewater treatment, water recycling and desalination infrastructure; Consulting in the field of industrial water treatment, wastewater treatment, zero liquid discharge (ZLD) wastewater treatment, water recycling and desalination infrastructure engineering; Consulting services for others in the field of design, planning, and implementation project management of industrial water treatment, wastewater treatment, zero liquid discharge (ZLD) wastewater treatment, water recycling and desalination infrastructure, plants and equipment; Product design and development in the field of industrial water treatment, wastewater treatment, zero liquid discharge (ZLD) wastewater treatment, water recycling and desalination infrastructure, plants and equipment and their component parts