FTC and processing method of a liquid using the same

A separator (1), electrode (2) and collector (3), each made of a polygonal sheet, are stacked up in a multi-layer serial arrangement of [3/2/1/2] sub /3, with the provision of a through-hole in the respective sheets in the corresponding position for passage of a liquid. The stack is accommodated in a housing (8) so that it may be compressed from both sides at a pressure 0.5 kg per cubic meter G by tightening a retainer (4) which doubles as a cover. The liquid to be treated is passed through the capacitor through an inlet and outlet (5).