In order to avoid any disturbances dry and oil-free compressed air is required for blasting processes with compressed air (injector and compressed-air blasting). The processing of compressed air therefore plays an important role. The water contained in the compressed air causes corrosion within the compressed-air network and influences negatively the operation of the tools; this could lead to considerable subsequent costs. This occurrence of condensate causes corrosion in the blasting pot during blasting processes with metallic abrasives. Furthermore, the abrasive forms lumps which could clog the pot.