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der in die steuerung eingebaute frequenzumrichter dient zur optimalen entwässerung des sandes.
the frequency regulator built in the control ensures the equal loading of the sand washers as well as the optimal desiccation of the sand.
dadurch werden zum einen verschmutzungen entfernt, zum anderen raut die abrasive wirkung des sandes die oberfläche auf.
when this is done, dirt and contamination is removed and while the abrasive effect of the sand roughens the surface.