Summary of Personal Communications with Brandon Saunders, Polar
Refrigerant Technologies (New Hampshire), Randy Blackburn, Commercial
Fuel Recycling, LLC. (Idaho), and several other people who didn’t want
to give their names.  They all provided the following similar
information:

•	The steps to use the used oil are: test for on-spec vs. off-spec
(although it was noted that nearly all is on-spec these days); using
solvents, remove as much water (and sometimes antifreeze) from the oil
as possible; filter out metal scraps and other larger particles using
screens. 

•	The filtering can be done when the oil is collected, or in the
burner when the oil is added. 

•	The oil is also allowed to set and can be extracted at a depth with
a higher rate of purity. 

•	As far as what percent, the filtering and extracting of water is
standard practice in the industry.

