Abstract: A device for precipitating suspended materials from a liquid, in particular for precipitating gypsum from water, having a vessel comprising a liquid inlet and a liquid outlet, and subdivided into chambers that are in sequence in the flow direction by means of partitions, wherein the liquid inlet opens into a first of the chambers and the liquid outlet opens into a last of the chambers. At least one part of the chambers and preferably every chamber communicates with the chamber downstream thereof in the flow direction by means of an opening in the partition disposed between the chambers. The opening extends at a distance from and parallel to an upper edge of the partition, and each of the openings is disposed at a greater distance from the vessel floor than the opening in the partition downstream thereof in the flow direction.