It seems that the regeneration and production of iron ions (Fe2+) increases when iron electrodes are used. So, the requested iron salt (as a source of Fe2+) decreases and hydrogen peroxide is proportionality consumed. Furthermore, current density and reaction time are more than those of the iron electrodes to cover iron ions leakage effect in the EF-Al although these conditions cannot provide Fe2+ ions as are produced in the EF-Fe. On the other hand, reaction time and current density increment (in the aluminum electrodes) cause Eq. (14) on the anode surface. These produced metallic ions and excess hydrogen peroxide (resulted from the Fe2+ ions leakage in the solution) intensify the color and decrease color removed. Therefore, COD and color removal will be decreased.