In this study, the two-stage electroflotation-rising process was investigated with the aim of improving the performance of the conventional one-stage electroflotation process. A total of 32 min (the electroflotation and rising times were 30 min and 2 min, respectively,) was required when a current of 0.35 A was applied in the one-stage electroflotation-rising experiment. The amount of electric power required to treat 1 m3 of water was 1.75 kWh/m3. For the two- stage system, the time required to achieve a turbidity removal rate of over 95% was 16 min (50% of the one-stage system). The amount of electric power required to treat 1 m3 of water was 0.59 kWh/m3, which was only 33.7% of that required for the one-stage process. The total treatment time and electric power were excellent in case of the two-stage system in comparison with those of the one-stage process. The rate of turbidity removal for the horizontal electrode arrangement is 9.3% higher than that of vertical electrode arrangement. When Na2SO4 was used as the electrolyte, the optimum electrolyte concentration was 1.0 g/L.