In the case of a filter pipe for wells, with longitudinally running ribs (3) on the outer wall and with slits which are arranged transversely thereto and lead into the interior of the filter pipe, the slits are formed by a continuous groove (5) which runs on the inner side of the filter pipe (1), which extends along a helical line in the longitudinal direction of the filter pipe (1) and the depth of which is dimensioned such that it reaches partially into the ribs (3). <IMAGE>
