A complete line of aspiration machines are manufactured by Forsbergs. The most popular and widely utilized are the Pneumatic Aspirators. These are available in four sizes to meet specific capacity requirements. The Closed Circuit Pneumatic Aspirator is also available for total dust control. The Pneumatic Aspirator has been designed to efficiently and quickly "airwash" dry granular products prior to screening, gravity, and destoning separations or to remove dust or light impurities and materials from heavier or good products. Since the Pneumatic Aspirator has virtually no moving parts, the machines require very little maintenance.