Abstract
Recent years, the water system change of paints is advancing from the problem of environment pollution and the problem on work environment. However, the frequency which cleans the coating equipment and others after the use in water increases at water system paints’s increasing as for paints employer side. The process of washing water was accompanied with this, came to use much water, and became a subject. A large amount of expenses become necessary for abandoned water process but the process way by the coagulant spreads as a way which deals simply with washing water and it is to put into the practical use and to doing a change. It used a coagulant, worked the abandoned water process after paints washing, and the effect was inspected this time. The result of investigation study is reported.