| 摘要 |
PROBLEM TO BE SOLVED: To provide filtering method capable of purifying turbidity of bath water generated at the beginning of installation or the initial state after maintenance, having long filterling period and capable of using a filter element over a long time. SOLUTION: Zeta potential is applied to an absorbent or high accurate filter material to prevent that fine particles attracted to either one of them from being washed off to flow and, in order to form more stagnation parts or flow, coarse nonwoven fabric with average pore size of 50-500/μm and high density nonwoven fabric or woven fabric 10 are rolled many times in a roll form and hot water is allowed to flow through gaps 16 between the nonwoven fabric or woven fabric and the coarse fabric to effectively remove a contaminant such as a subspended substance without generating clogging.
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