There is a reply to the question of removal of metallic oxides here in this forum, by Greg..
The process is Electro STATIC not ElectroLYTIC. Hence dissolved components cannot be affected. In a static field salt will not separate out of water, for instance.
Only particles, being separate from the oil, will be separated out. There is a wealth of trial evidence to prove that dissolved additives cannot be removed. Only "foreign" particles are removed.