Environmental products and their equipment, UV light disinfection products, wastewater treatment equipment, air pollution control equipment, and photocatalytic product technology development and sales; noise, air pollution, and wastewater treatment; sales of non-ferrous metals, stainless steel, and steel; domestic commerce and material supply and sales (excluding legal and administrative regulations, State Council decisions prohibiting, and projects requiring prior approval, excluding production and processing). Permitted business operations include the production of water treatment equipment.