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k1 k3 k5 biofilm media Feb 02, 2018 Among the nine provinces and cities, the best water quality is Hainan Province, the second type is mainly in Shanghai and Beijing, and the third in Heilongjiang and Jiangsu, and in the four provinces of Jilin, Liaoning, Guangdong and Ningxia. Water pollution continues to intensify, making the sewage treatment and recycling industry received unprecedented attention, in the past two years, the gross margin of the region has remained around 70%, and even some regions over 100%, the industry has great potential for development.