| 摘要 |
PROBLEM TO BE SOLVED: To provide a circulation cleaning method of stored water for maintaining the stored water at excellent water quality level and lowering the initial cost by using a hollow fiber membrane. SOLUTION: This circulation cleaning method includes a process for filtering stored water (for example, pool water, bath water, hot spring water, household bath water, water for water tank of an aquarium, water for water tank for cultivating an aquatic, artificial pond water, circulation hot water, circulation cool water, circulation washing water, circulation processed water, and boiler circulation water, etc.), by using the hollow fiber membrane having 1-10μm fractionated particle size. The fractionated particle sizes of the hollow fiber membrane is preferably 2-5μm.
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