Darn nice find!
The finest mesh has 5.5 thousandth of an inch openings.
I need a ruler: never mind that, I need a microscope!
From the CPU backside thread, this is the smallest opening that I'll be dealing with:
.0226" (0.57 mm)
That's ~570 microns, so if I go with a filter element that'll catch anything that's a quarter of that size, I should be ok.
So I'm down to ~150 microns
The finest element on that page would be perfect.
The next question is: how restrictive is it? I'll order it and find out. A 3" by 3" should be enough to make a cone.
Edit: measurement correction. 1mm = 1000 microns.
Edit: manufacturer measurement fixed.