Manufacturing & Processing: Water Treatment Equipment. Operations involving projects requiring prior approval may only be conducted within the approved validity period. Wholesale & Retail: Water Treatment Equipment, Automation Equipment, Electrical & Mechanical Equipment (excluding specialized control), Pressure-Regulating Water Supply and Exhaust Units, Full-Flow Water Treatment Systems, Side Flow Water Treatment Systems, Electronic Purification Equipment, and Water Treatment Equipment; Services: Technical development and technical services for mechanical instruments and fluid equipment; on-site installation of electrical and mechanical equipment.