| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of cleaning a filter medium capable of removing deposits thoroughly from the medium with no limitation on the range of utilization of treated water and little lowering of the treating efficiency and a filter system employing the method. SOLUTION: The method is employed in cleaning a filter medium 18 by causing a part of treating water after filtering to pass in the direction opposite to the filtering direction with respect to the medium 18 and has a process of adding, before filtering, a disinfectant to raw water to be used in cleaning. COPYRIGHT: (C)2006,JPO&NCIPI
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