A professional who tends steam-jacketed kettles, mixing tanks, filter press, string filter, and related equipment to process ammonia solution and aluminum sulfate into aluminum hydroxide. Respnsibilities include:

• Meters water into steam-jacketed kettle and sets thermostat at specified temperature.
• Dumps preweighed bags of aluminum sulfate into kettle, and starts agitator to dissolve ingredient.
• Meters specified amounts of hot water and ammonia into mixing tank and starts agitator.
• Pumps aluminum sulfate solution through filter press into heated agitator tank to remove insoluble materials.
• Pumps ammonia solution to tank with aluminum sulfate solution.
• Ladles sample of mixture, adds test solution, and observes color reaction to determine degree of precipitation.
• Adds specified ingredients to mixing tank to complete precipitation, according to results of test.
• Pumps slurry through string filter to separate aluminum hydroxide from mixture.
• May replace filtering media and repair equipment, using handtools.