The business scope includes the design and sales of filter elements, filtration equipment, and filtration consumables; the design and sales of pure water, wastewater, waste gas, and dust purification treatment equipment; environmental engineering design; technology development, technical services, technology transfer, and technical consulting in the field of environmental technology; import and export of goods and technology. (Projects subject to approval by law must undergo approval from relevant departments before commencing business activities.) General projects: sales of instruments and meters; sales of pumps and vacuum equipment; sales of valves and cocks; wholesale of hardware products; sales of textiles and raw materials.