A professional who tends heated kettle and filter press in which lye is treated with chemicals to remove undesirable properties in glycerine purification process. Respnsibilities include:

• Starts pump to transfer premeasured lye into kettle, starts agitator to mix batch, and turns steam valve to heat kettle to prescribed temperature.
• Dumps specified amounts of dry chemicals or pumps liquid chemicals into kettle to attain product of specified concentration.
• Inspects batch sample for clarity and submits sample laboratory for testing.
• Regulates chemical concentration of batch, following laboratory report.
• Pumps batch through filter press to remove materials precipitated during treatment.
• Cleans filter press and replaces filter cloths, using handtools.
• Records kettle temperature, agitation and treating time, and amount of chemicals used in process.