I was told years ago a Micron was one millionth of a inch, not sure if the was a sqaue inch, cubic inch or linear inch Way smaller than the average eyes can see I ended up using a #10 combination fuel shut off and in line fuel fiter that was rated at 80 micron on my Duster between the pump and the gas tank sump, I should have bought the 100 micron size according to Mganafuel My new car will have that size filter rating in a 12 AN in line fuel filter with as much surface area and as long as I can get it I put the Duster together with a BG 500 in line fuel filter, it had a 10 micron fuel filter in it and it did starve the Magnafuuel 275 pump I bought new for that car Live and learn