A professional who tends equipment that pumps aluminum hydrate from secondary thickeners through wash tanks to storage tanks. Respnsibilities include:

• Turns valves to regulate amount of hydrate flowing into thickeners and washing tanks to maintain specified density of hydrate.
• Adjusts valves and pumps to transfer hydrate from secondary thickeners through wash tanks into seed storage tanks.
• Tests sample of hydrate to determine its density, using hydrometer.
• Lubricates valves and adjusts packing glands to prevent leaks.
• Keeps operating log.