Separating, Filtering, Clarifying, Precipitating, and Still Machine Setters, Operators, and Tenders set up, operate, and tend continuous flow or vat-type equipment, filter presses, shaker screens, centrifuges, condenser tubes, precipitating, fermenting, or evaporating tanks, scrubbing towers, or batch stills. These machines extract, sort, or separate liquids, gases, or solids from other materials to recover a refined product. This category includes dairy processing equipment operators.