| 摘要 |
PROBLEM TO BE SOLVED: To improve back washing efficiency regardless of the air passing pore diameter of a filter membrane layer. SOLUTION: A base material layer 2 composed mainly of a sintered compact of a ceramic particle such as silicon carbide particle having 300-400μm particle diameter, the filter membrane layer 3 of a fine porous layer provided on the surface of the base material layer 2 and having 80-100μm thickness and 15-25μm average pore diameter and a ceraic particle forming many projections on the filter membrane layer 3 and 30-200μm average particle diameter.
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