They are used in the processes of removing impurities from natural and crushed aggregates.

Used for dewatering and recovering sand from sand slurry generated during the processing of mineral aggregates, as well as for operation with a suction-dredger (refuler).
A twin-shaft sword washer is a device used to wash gravel and sand mixtures with a granulation of up to 80 mm and a sand point of 25-30%, fed uniformly. Log washers achieve good dissolution of clay particles, with the exception of water-insoluble components. Furthermore, wood and other floating materials are washed away by a stream flowing in the opposite direction of the washed gravel and sand mixture.