[ Water desalination plants, fresh water generators to separate pure water from salt and other sediments; water distilling units; ] evaporating concentrators used in water recovery from waste water, in collecting of valuable resources from waste water, and in reducing waste water [ ; sewage treatment plants; ozone sanitizers for air and water; water treatment equipment, namely, chemical and ultraviolet sterilization units for use with seawater and waste water; thickening and dewatering machines for use in treatment of water and waste water; heat exchangers, heat exchangers for marine purposes; cooling apparatus, namely, chill rolls and rotary thermosiphon chill rolls that use water for cooling materials for use in manufacturing processes; icemaker unit, freezers, air purifier for collecting fumes and purifying the air; industrial air purifiers, gas scrubbers ]