I can filter oil down to ISO4406 class 7/4 using a roll of toilet paper. You just keep on pooring the one liter of oil through a million times and the oil is particle free.
Please stop using these boards as a marketing place.
HITEN: I think you will find some discution about the subject here:
https://forums.noria.com/eve/forums/a/tpc/f/938604995/m/359104782
https://forums.noria.com/eve/forums/a/tpc/f/938604995/m/404108932