Water purification materials in texas are registered at 300 metres north of the tewon street park in the county plains of texas, shandong province, with registration as the district market supervision authority in the plains, representing chu lianbao, and covering general items: sales of new organic active materials; manufacture of specialized chemical products (without dangerous chemicals); sale of specialized chemical products (without hazardous chemicals); sale of fire-resistant materials; sale of pumps and vacuum equipment; sale of mechanical equipment; sale of mechanical parts and components; sale of chemical products (excluding licensed chemical products); engineering management services; sale of specialized equipment for environmental protection; technical services, technology development, technical advice, technology exchange, technology transfer and technology promotion. Licensing projects (in addition to legally approved projects, operating on an autonomous basis under an operating licence): hazardous waste operations; sewage treatment and recycling. (a project subject to legal approval may only be carried out with the approval of the relevant department, subject to the approval documents or licences of the relevant department)