The results show that the filtrating property index (FPI) of inverse graded filtration appears 5 times higher than traditional one and it may be more advanced if the turbidities of influent and elfluent of the filter were taken into account.

• 根据试验资料计算结果；反粒度过滤的过滤性能指数(FPI)比传统快滤池高5倍；如果考虑过滤前后的浊度；则性能更显优越.