42 Consulting, research, design, and development services in connection with water and wastewater treatment, water filtration and purification, water softening, desalination, brine treatment and volume reduction, chemical dosing of water, chemical precipitation, and chemical recovery from water and wastewater; technical services for monitoring water condition and quality; provision of technical advice relating to the design and operation of plants and equipment for water and wastewater treatment, water filtration and purification, water softening, desalination, brine treatment and volume reduction, and chemical recovery from water and wastewater