PURPOSE: To reduce the rising speed of pressure loss with the collection of fine particles in water, by controlling the intensity of a magnetic field so as to make the same max. in the effluent part of treated water and min. in the inflow part of raw water.
CONSTITUTION: A pole piece 3A made of SUS304 being a non-magnetic body is arranged to the raw water inflow side of magnetic stainless steel wool 2 and a pole piece 3B being a ferromagnetic body is arranged to a treated water effluent side while an electromagnetic coil 5 is arranged to the outer periphery of a filter tower 1 and further surrounded by a return frame 4 made of soft iron. As a result, because ferromagnetic fine particles in water can be collected while dispersed in the magnetic stainless steel wool, the rising speed of pressure loss becomes mild. In addition, the pole piece 3A of the raw water inflow side can be formed of a magnetic body having small saturation magnetization of about 10W100emu/g.
KUBOTA SHIYOUJI
TAKASHIMA YOSHIE
