How to reduce lead in electrolytic copper powder?

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During the production of electrolytic copper powder, since the electrical efficiency of the anode is higher than that of the cathode, once the concentration of copper ions reaches a certain level, it is necessary to use an insoluble anode to remove copper; once the copper ion concentration drops to 1 g/l, it can be returned to the system. In this process, lead plates are used for copper removal; the lead plates purchased from Guizhou have a cell voltage of 3–3.5V, and the operation is intermittent. The lead content in the copper powder can reach 1000 ppm, which is likely due to the shedding of PbO2 from the surface of the lead plates. Titanium plates are also used for copper removal, but the cell voltage required for pure titanium is extremely high. As for using plates coated with precious metals, the investment cost is too high. What are some good alternatives? Anode bagging? Which bag to choose? Thank you so much