You can't see 5 microns. I do hydraulic fluid contamination analysis on the Navy jet I fly on and you can't see anything that small in the fluid. Visible particles are probably larger than 25 microns.
"I can imagine no more rewarding a career. And any man who may be asked in this century what he did to make his life worthwhile, I think can respond with a good deal of pride and satisfaction: 'I served in the United States Navy.'"
President John F. Kennedy, 1 August 1963.
1999 Honda Shadow VT1100C2 ACE