Water pollution classification: according to water pollution qualitative District sewage treatment plant equipment prices, water pollution has two types: one is natural pollution; the other is man-made pollution. Ruizhao Xiang Shandong Environmental Protection Equipment Co., Ltd. Shandong Ruizhao Xiang Environmental Protection Equipment Co., Ltd. is a production, research and development, sales, technology promotion and application of environmental protection as one enterprise. My company to undertake various sewage treatment works and equipment manufacturing and sales operations. Supplying plant sewage treatment equipment