The optimal performance, taking into consideration the costs and EC efficiency, were obtained with a combination of iron electrodes (Fe-Fe), at 2 cm distance between electrode, at current of 0.1 A and pH = 6. After 90 min of treatment, maximum Mn removal obtained was 89%, 100% for Cu and 100% for Zn, at an energy consumption of 2.55 kWh/"m" ^"3