A professional who tends kettle that refines grease according to specifications. Respnsibilities include:

• Moves lever to admit grease into kettle and opens valve to admit steam into grease to control boiling.
• Draws off sample of grease and inspects it for clarity.
• Starts pump to add required amounts of acid to kettle and boils grease with acid until grease reaches specified clarity.
• Closes steam valve and allows water and impurities to settle to bottom of kettle.
• Opens valve to drain off water and impurities.
• Closes drain valve, opens steam valve, and starts pump to fill kettle with water.
• Boils mixture for specified amount of time to wash out acid and remaining impurities.
• Opens drain valve to drain off water and impurities.
• Pumps grease to storage tanks.