A professional who assists top-precipitator operator in precipitating aluminum hydroxide from rich liquor. Respnsibilities include:

• Opens valves and starts pumps to fill precipitators according to schedule and to add specified seed charges to tanks as directed, using levelometer to determine amount of seed added.
• Raises and lowers circulating lines, using electric hoist.
• Drops metal weights from tops of tanks to break scale and crust formations in empty tanks.
• Lubricates valves and adjusts packing glands to prevent leaks.
• Examines precipitator tanks for adequate circulation and empty tanks for cleanliness.
• Performs other duties as described under helper master title.