Back flushable filtration device and method of forming and using same

[A subject] Reproduce a filter by reverse flash processing. [Means for Solution] A filter contains a monolith (10) made with a porous material (14) which has an entrance end (16) and an exit end (18). Raw material is prevented from being blockaded by an entrance end and an exit end of a monolith, and flowing through a passage (22, 26) of a monolith into an exit end directly through a passage from an entrance end by this. A micro porous coat (28) which has an average hole size smaller than an average hole size of monolith material covers the surface of a passage.