Since 1930, Oliver has provided seedsman worldwide with expertise and
equipment to make the most precise density separations.  A complete
line of density separators with capacity rates up to 43,000 pounds per
hour are available. 

Oliver Gravity Separators are known for excellent separation efficiency
on green coffee.  The "Oliver" is rated as "The Best Separator" all
around the world, and is the choice for the discerning green coffee
processor.  If your screened / sized material still has contamination,
density separators or stoner separates same size particles by specific