Secondary fuel filter change and she's spotless!

I changed out my engine mounted secondary fuel filter today and brought it home to do a biopsy and see what was inside. It had 150 hours on it. I have a primary Racor 2 micron filter upstream, and so I thought not much should get through. Sure enough, that filter was spotless after 150 hours.

And, I have been running a high % biodiesel these past 150 hours and know that it has been cleaning out my old 70 gallon diesel tank. But none of that gunk made it past my Racor. I thought these pictures would be fun for some to see. The line on the filter element is from my hacksaw blade!