FIELD: systems for regenerating etching solution. SUBSTANCE: apparatus includes tank in the form of cylinder or polyhedron inscribed in cylinder and cover. Two or more electrodes made of water permeable material are arranged in tank coaxially one relative to another and to tank. Electrodes form communicated cavities in tank. Branch pipe for ejecting solution is arranged in central portion of cover coaxially with tank. Additional gas discharging tube arranged in cover and branch pipe for ejecting solution are connected with cavity restricted by outer electrode and tank wall. Gas discharge tube allows to extract out of solution ions of metals that are more electrically negative relative to copper. EFFECT: enlarged manufacturing possibilities of apparatus. 2 dwg
