Quote Originally Posted by nike123 View Post
A new filter drier will pull the moisture out of the POE very quickly (usually less than an hour of operation).

Vacuum will pull the moisture out of the POE, but it will take days if not weeks of constant vacuum and breaking with dry nitrogen cycles. It's much quicker and easier to remove the moisture with a new filter drier.
Hence why one must remove the oil! The slight bleed of ofn really speeds up the drying of the system with out having to change vac oil