Oil Study from Grease+ Schultz - filtration calc?

[GeorgeGear]

It is not quite clear to me exactly what procedure they followed to calculate filtration performance. Can anyone enlighten me?

Most of it is still available on archive.org, under www.oilfilterstudy.com.

 

[Ken42]

Link is down.
Ken

 

[unDummy]

Go to archive.org and punch the link in there

You should still be able to find and download the spreadsheet from archive.org