Originally Posted by
DropBarFan
Interesting, thanks. I use large restaurant-size coffee filters so filtering is not esp time-consuming but if it doesn't clean out the black grime I suppose why bother & just decant as you suggest.
BTW, while sand & grit is obviously not good for chains (wear & friction) I wonder about the black grime's effect on wear/friction? I guess it's fairly minimal but OTOH never read any research about that. At any rate it's a hazard to clothes & car interiors.
The "black grime" IS the particulates, the sand and grit. The solvent and dissolved grease are not highly colored. The dark color in the grit comes from the finely divided metal particles, not the liquids. Once you filter those out, your still contaminated solvent (grease) should be light colored. And without the particulates, there will be no reason for the solvent/grease to cause wear.