| 摘要 |
A filter element (1) for liquid permeable floor area fastening (17), a floor covering plate (15), a manhole cover (15), a sewage cavity or the like, with at least one pre-filtering layer (3) in the direction of the through-flow (2) and at least one following filter layer (4,4'), wherein the free through-flow sections (a, b, b') of each layer (3, 4, 4') increase from layer to layer in the direction of the through-flow. The filter also comprises a housing (5) which surrounds the filter layers (4,4') in a framelike manner and maintains them, wherein each filter layer (4,4') is formed from granular material and the grains are available in loose form or linked to each other by a weak binding agent.
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