Fig. 6 shows the variation of specific cake resistance with filtration time at low and high mixing intensities during chlorination. At low mixing intensity, the cake layer of both oxides exhibited much higher specific cake resistance, along with smaller df, which accelerates the decline of the relative flux, as seen in Fig. 5. The results show that flux can be improved by enhanced-mixing oxidation as a result of the formation of a permeable cake layer with low cake compressibility in the membrane filtration.