http://www.chanxiuren.com/category/guojibiaozhun/iso2046822019shui-hui-yong-xi-tong-chu-li-ji-shu-xing-neng-ping-jia-zhi-nan-part2gen-ju-wen-shi-qi-ti-pai-fang-ping-jia-chu-li-x.html 　Guidelines for performance evaluation of treatment technologies for water reuse systems — Part 2...