In this study, effects of initial phosphate concentration and current density on phosphate removal by electrocoagulation using aluminum and iron plate electrodes were investigated and effects of these parameters on system parameters were analyzed. In the experiments using aluminum electrodes, efficiency of 100% was obtained for all initial phosphate concentrations. Initial phosphate concentrations have effected energy consumptions and reaction rates. But when iron is used as electrode material, removal efficiencies have reduced by increasing initial phosphate concentration. Because of this, reaction rates have decreased by increasing initial phosphate concentration and removal efficiencies are mainly due to pH using iron electrodes. Extension of reaction time has caused excessive increase of pH. Removal rate is very slow over pH 9 approximately. Consequently, if pH is not fixed, it is hard to reach efficiency of 100% in high initial phosphate concentrations using iron electrodes.