STATION 6. Drag-Out Tank Station 6 is intended to capture electropolishing solution dragged out of Station 5 by the parts and to concentrate the dilute electropolishing solution for re-use or for waste disposal as spent electrolyte. Drag-out tanks may be used as drip tanks, equipped with spray nozzles, or used as immersion tanks. The equipment normally consists of a tank with appropriate electric immersion heater or steam coil for evaporation of water from the dilute electropolishing solution. This arrangement may be augmented with a thin-film evaporator which uses a packed chamber and forced air circulation to increase the rate of water removal. Evaporation rates of 10-20 gallons per hour may be obtained with the thin-film evaporator. Further concentration is accomplished by heating when the electropolishing system is not in use. Overnight or weekend heating may be necessary to concentrate the solution sufficiently for reclamation. Electrolyte which has been concentrated to a specific gravity of about 1.60 can be returned to the electropolishing tank for further concentration. Additions of the re-concentrated solution should be made at the end of a production run, so that the bath will have time to assimilate the additions and to evaporate excess water. The specific gravity of the solution in the electropolishing tank should be checked before production is resumed. The re-concentrated solution may also be placed in drums for disposal by a certified waste hauler.