As of 2021 there were 48,620 people employed as Separating, Filtering, Clarifying, Precipitating, and Still Machine Setters, Operators, and Tenders within the United States.
This represents around 0.03% of the employed workforce across the country.
Put another way, around 1 in 2 thousand people are employed as Separating, Filtering, Clarifying, Precipitating, and Still Machine Setters, Operators, and Tenders.