A professional who controls equipment that separates mud from alumina liquor and recovers soda from mud. Respnsibilities include:

• Pumps thickened mud to washers and turns valves to regulate flow of water into washers.
• Turns valves to release specified amount of mud into washers to maintain sludge balance.
• Turns valves to pump sediments from washer into earthen thickeners.
• Opens valves to introduce starch into mud settlement and to regulate flow of milk of lime at specified rates.
• Lubricates valves and adjusts packing glands, using grease guns and wrench.