The Centrifugal Stone Separator (ZSA) gently removes stones and other specifi cally heavier foreign matter from the stream of produce. Separation of stones and produce is based on the source-fl ow principle. The source water fl ow is guided into the ZSA from below. It is adjusted exactly so that the fl ow rate of the water is higher than the settling velocity of, for example, potatoes, but slower than the settling velocity of stones. Only foreign bodies whose specifi c weight is signifi cantly greater than that of water are discharged.