This purification stage uses an electrolyte of copper sulfate solution, copper anodes, and strips of high-purity steel sheets for the cathodes. As more and more pure copper is deposited, the cathodes "grow". To achieve top results, we apply BMX technology. This involves a new parallel flow pattern inside the electrolysis bath. What happens here is that the flow pattern produces two effects: It improves yield cathodic deposition and lowers energy consumption by increasing current density.