Maintaining certain concentrations of thiourea, glue, and chloride ions in the electrolytic solution is necessary to promote efficient and homogenous copper deposition in electrorefining. Over the past year, new practices have been implemented and standardized at the Rio Tinto Kennecott (RTK) Refinery to improve the control of these concentrations within these set limits. Through a better understanding of plant processes, greater interdepartmental collaboration, and consistent daily checks, improvement was observed. Average current efficiency increased and varied less in the face of condition changes such as outside temperatures, varying pull cycles, and use of slightly out-of-spec anodes.