The registration address of the sioux county trades and industry company is no. 355 of the sioux state industrial park, which is the administrative approval board of the sioux state industrial park, represented by a legal person, and includes the processing, production and sale of: water treatment condensants; and the sale of chemical products, daily department goods, labour insurance supplies, packaging materials, environmental equipment, and engineering design and commissioning of water treatment equipment. (projects subject to legal approval may not operate without the approval of the relevant department)