1 Water treatment chemicals for the treatment of cooling, boiler, heat-exchanger, heating, condenser, and closed-recirculating water systems and fire sprinkler systems to prevent or control scale, corrosion, or microbiological growth
40 Water treatment and management services for others in connection with cooling, boiler, heat-exchanger, heating, condenser, and closed-recirculating water systems and fire sprinkler systems; consulting services in the field of water treatment
42 Testing, analysis and evaluation of cooling, boiler, heat-exchanger, heating, condenser, and closed-recirculating water systems and fire sprinkler systems; analysis of water quality