[Clay Henry]

With talk of filtering and micron ratings i thought this would be a good post.

Micron Size Comparison Chart

Particle Size
(Microns)

25,400 beach sand
100-2000 eye of a needle
1230 pollens
10-1000 saw dust
30-600 coffee
4-400 dust mites
100-300 table salt
120 human hair
70 lower limit of visibility (naked eye)
40 household dust
40 mold spores
25 white blood cells
10 talcum powder
8 red blood cells
3 bacteria
2-3 spider web
2 lead dust
0.1-0.8 corn starch
0.5 tobacco smoke
0.5-2 90% of all oil contaminants
1 0.001 millimeter