Furthermore, the magnitude of flux decline of membrane filtration with Fe oxides is less than that with Fe–Mn oxides at a constant mixing intensity during chlorination. This suggests that the composition of oxides influences the properties of a cake layer in addition to mixing intensity. The results show that permeate flux of membrane filtration can be effectively improved by enhanced mixing for Fe and Mn oxidation for 5 min. It was also found that the presence of Mn aggravates the membrane fouling. The characteristics of the oxides can also determine the subsequent cake layer on membrane surfaces. In other words, the oxides formed from chlorination could indirectly influence the performance of membrane filtration.