process of restoring used lubricating oils by filtration, clay absorption, and/or chemical treatment to a condition similar to virgin stocks This is not to be confused with re-refining operations in which the used oil is vacuum distilled and chemically treated to return it to a state similar to its virgin condition
The process of removing ink and stencil from a screen to enable that screen to be reused
Processing or returning used refrigerant to the manufacturer or processor for disposal or reuse