Filter elements for filter

摘要

A filter element (10) has an upstream-side filter layer (12) and a downstream-side filter layer (14). The downstream-side filter layer (14) is attached to the upstream-side filter layer (12). The upstream-side filter layer (12) has a coarser mesh than the mesh of the downstream-side filter layer (14). The upstream-side filter layer (12) has a plurality of through-holes (12h) formed therein and extending throughout the thickness of the upstream-side filter layer (12). The plurality of through-holes (12h) allows the filter element (10) to continue to be used when the rest of the upstream-side filter layer (12) is clogged and the downstream-side filter layer