The EC process consists in the destabilization of a suspension, emulsion or solution of contaminants in water by the application of a direct electric current, which is the electromotive force that induces the chemical reactions involved in the process, simultaneously neutralizing the net charge of the contaminants’ surface and producing (in situ) the chemical agents that act as nuclei for particle agglomeration. The design of the Electro-coagulation units depends on the nature of the contaminants and their concentration. If the sedimentable solids are dominant in the solution, the equipment must be designed according to the sedimentation in the secondary separation phase, whereas if the mixture has a large load of oils & fats and low density solids, the units must be designed with a collector for the floatable particles.