The invention provides a filter structure. A second porous film having a plurality of second holes is disposed on a first porous film having a plurality of first holes. The second holes are smaller than the first holes. The filter structure has excellent venting efficiency and avoids the problem of having blocked holes as a result of filtrated residue. The filter structure can also be dried by an easy and power-saving method such as compression. The invention also provides a method for filtration. The above-mentioned filter structure is provided. A mixed solution drifts down onto a top surface of the second porous film of the filter structure. Residues larger than the second holes in the mixed solution are intercepted, and a liquid in the mixed solution passes through the second holes and keeps flowing down.
The specific structure design of filter including filtration layer, absorption layer and supporting layer and the operation thereof including accelerating filtration permeation and driving backwash by extruding
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