The purpose of the present invention is to increase the removal ratio of unnecessary substances including cytokines in a concentrator in an ascites treatment system. An ascites treatment system 1 is equipped with: an ascites bag 20； a filtration device 21； an ascites treatment circuit 10 involving a concentrator 22 and a concentrated ascites bag 23； a warming means 11 for warming ascites and/or a filtrate in the ascites treatment circuit 10 to increase the temperature of a liquid to be introduced into the concentrator 22； and a diluting means 100.本發明提高腹水處理系統之濃縮器之細胞激素等無用物質之去除率。本發明之腹水處理系統1包括：腹水處理迴路10，其包括腹水袋20、過濾器21、濃縮器22及濃縮腹水袋23；加溫機構11，其對腹水處理迴路10中之腹水或過濾液之至少任一者進行加溫而提高導入至濃縮器22之液體之溫度；及稀釋機構100。
