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Below is a few articles of beta ratio, efficiency, ratings that you might find interesting: Filters are rated on their ability to remove particles of a specific size from a fluid, but the problem is that a variety of very different methods are applied to specify performance in this way. Pore...

I have reading on this site for a while now and I just want to comment on automotive oil filters. First off...its seems to be a little too critical on technical specs of these filter element when most automotive filters down to 20-25 micron. Think about this for a second.... most of your bearing...