The filtrate solution enteres into two operational tanks so as to remove its cobalt eradication is performed by adding permanganate and stabilizing PH by lime water. In this stage, the filteration process is done by using two filter press machines. In next stage, in order to remove nickel and cadmium, the solution enters into two separate tanks in which powder is added to finish eradication process. The filtration is carried out using two filter press machin. The final solution (make up) is transferred into three tanks with the capacity of 160 cubic meters. In this stage, the solution is ready to charge into electrolysis.