FILTER HAVING MOVABLE FILTER MEDIUM PART AND ITS OPERATING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a filter whose capacity for removing depositions stuck to and accumulated on the surface of a filtering member is enhanced while suppressing the size of the filter from being large. SOLUTION: This filter 40 has the first water treating chamber 45 and the second water treating chamber 46 to which the water to be treated can be supplied individually. The filtration part 50 of the filter 40 has the first filtering member 52 for filtering the water treated in the chamber 45 and the second filtering member 54 for filtering the water treated ire the chamber 46. The part 50 can be moved between the first position abutting on the first stopper 47 and the second position abutting on the second stopper 48 by the pressure difference between the chamber 45 and the chamber 46.