Originally Posted By: xtell
Every Centrifuge picture or video I have seen, whether from a Centrifuge manufacturer or user always shows some sort of debris "spun" out of the oil in a used Centrifuge. Thus, they must be working. Same with the toilet paper bypass filters. When you change one out, the old one is always dark with contaminants. As always, its everyone choice to use one or not...
Some large ship's diesel generators have large individual sumps for lube oil. If there is no ability to draw off, purify and return the oil, a paper-type centrifugal filter is used as a particulate separator. I've only seen a few changed in my life, but they did work, though they had a lot less in them than you'd expect. I'd bet money that the bottom of the sump was pretty gross, though.