Thanks, that's close enough. That technical article said 200 microns
was a good minimum size for a filter. That sounds about right to me.
Table salt is 100 microns.
Maybe something like this would let the heavy stuff drop out without
having a filter element to plug up?
Some handy size comparison info is below, from
Bacteria = 2 microns
Diameter of a red blood cell = 8 microns
Talcum powder = 10 microns
Diameter of a white blood cell = 25 microns
Naked-eye visibility threshold = 40 microns
Pollen = 60 microns
Diameter of a human hair, typical human = 70 microns
Table salt = 100 microns
Openings in window screen, typical screen = 1475 microns
(or .058 inches)
Distance needed for first down in football, "1st and ten" = 9,144,000
Distance needed for first down in football, after false start penalty
= 13,716,000 microns
Distance needed for first down in football, after holding penalty 18,288,000 microns
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