Filter for use in filter wells for the purification of surface water, with outer face of such a filter as well as a process for the design of a filter shaft

摘要

The present invention relates to a filter (18) for use in filter wells (10) for the purification of surface water. Further, the invention relates to an outer face (10) with such a filter (18) and a process for the design of a filter shaft (10). A filter according to the invention (18) for use in filter wells for the purification of surface water comprises at least one, at least partially formed by flowable material, of the surface water to be cleaned is to filter layer (28) with a total oriented transversely to the main flow direction by flow surface and a filter depth extending in the main flow direction, wherein the filter layer (28) downstream and upstream by means of separate support elements (26, 30) is limited. In this case, the filter layer (28) comprises at least one sample receiving element (50) with a portion of the filter layer (28) which extends over a portion of the surface of the total through flow area extends, wherein the sample receiving element (50), the sample and the receiving element (50) surrounding filter layer (28) are arranged and designed such that the sample receiving element (50), without adversely affecting the rest of the filter layer (28) from the filter (18) is removable.