To collect and concentrate rinse water for plating with a labor saving device, which does not need short-term maintenance and check, is suitable for enhancement of a strip passing speed and a continuous long-term operation of the plating equipment, and is not large-scale.

This plating equipment has an electrodialysis tank which employs polypropylene(PP) for a reinforcing material of an ion exchange membrane, and in addition, a two-fluid nozzle for cleaning of the plating liquid. Thereby, it can enhance the strip passing speed in the plating equipment, continuously work for a long time, collect and concentrate rinse water for plating by arranging just small electrodialysis cells, and in addition, efficiently collect and concentrate the plating liquid because the cells are resistant to a strong acid.