Design, production, and sales of energy-saving equipment, drinking water equipment, pure water equipment, water treatment equipment, campus water dispensers, direct drinking machines, water boilers, filter media, smart homes, daily appliances, kitchen equipment, and HVAC equipment; design and construction of drinking water projects, water purification system projects, air conditioning projects, hot water system projects, and HVAC projects Engineering, installation, and after-sales; assembly, installation, and debugging of water treatment equipment and air purification equipment; leasing of self-owned equipment (financial leasing is not allowed); wholesale and e-commerce of the above similar commodities, daily necessities, kitchen equipment, ceramic products, plastic products, communication products, electronic products, alcohol, and craft gifts (except cultural relics) services, import and export; and provide related supporting services, marketing planning, entrusted to engage in the sales of single-purpose prepaid cards; water dispensers, piped direct drinking water and quality water supply equipment, small household appliances, water treatment equipment, drinking water purification, mineralization and magnetization equipment, industrial and commercial electric heating food processing equipment, disinfection materials (hazardous chemicals removal), new R&D, wholesale and retail, import and export of membrane materials, new nanomaterials and related products, and related supporting businesses (the import and export of the above commodities do not involve commodities under special management such as state-owned trade, import and export quota licenses, export quota bidding, export licenses, etc. Commodities involving other special regulations shall be handled in accordance with relevant national regulations).