A professional who tends agitator tanks that mix chemicals with lime sludge to produce filler used in finishing paper. Respnsibilities include:

• Adjusts valves to control flow of sludge through filter screen into agitator tank.
• Adds acid and alum, and starts agitator to stir mixture.
• Tests alkalinity of mixture by titration test, and adds acid or alum as necessary.
• Weighs specified samples of sludge and compares them with standard chart to determine density.
• Screens sludge sample through wire mesh to detect presence of foreign matter.
• Records test results and quantities of sludge processed.