The invention relates to a device for the suction removal and delivery of fine deposits from a raw water zone (3) into a sludge collection zone (4) of a sewer-cleaning apparatus, in particular in vacuum cesspool cleaners, comprising a cylindrical container (1) which is divided by a piston (2), axially displaceably therein, into the raw water zone (3) and the sludge collection zone (4) and which can be non-positively and, via a stop (10), positively fixed in the cylindrical container (1), a blockable pipeline (12) which is open on both sides and whose opening on the side of the raw water zone lies close to the container inner wall in the lower container part is situated between the raw water zone (3) and the sludge collection zone (4).
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