Its main role is to reduce the raw waterpollutionindex, and residual chlorine and other impurities, to reverse osmosis water requirements.
其主要作用是降低原水的污染指数和余氯等其他杂质，达到反渗透的进水要求。
2
Even though the content of pollutant in the water of Longjiang-river was diluted by seawater, the average waterpollutionindex to the inlet of Fuqing bay is still as high as 3.2.
龙江水经过邻近海域的海水稀释之后污染物浓度虽有所降低，但是到了福清湾顶平均污染指数仍然高达3.2。
3
It summarizes shortages of present water quality evaluate methods, and puts forward waterpollutionindex evaluate methods, then explains detailedly its definition, calculate methods.