A professional who tends centrifuge and auxiliary equipment that washes and dries slurry solution, formed during making of soap, to recover glycerin-free salt. Respnsibilities include:

• Tests sample of slurry from decantation tank for salt content and to determine rate of flow of solution into centrifuge hopper, using testing instruments, such as hydrometer.
• Turns valve to run slurry into centrifuge and presses switch to start machine.
• Observes gauges to verify rate of flow and adjusts thermostat to regulate temperature of water in centrifuge.
• Opens valves to fill drums or silo with salt flakes.
• Turns valve to discharge liquid into holding tanks.
• May dissolve salt in liquid to make brine and perform specific gravity test, using hydrometer.