To enable a separation of water and solids, a flocculating agent is mixed into the thickened sludge during the sludge de-watering. The polymers used for this process are very expensive and therefore have to be used sparingly. The dosage of the polymers, respectively the concentrated flocculating agents depends on the solid matter content of the sewage sludge.

Berthold Technologies have developed a measuring system for this purpose, with which the solid matter content can be determined exactly and reliably.