Meant to post this yesterday but I didn't feel like typing it all out.
I decided to filter the remaining 5ml of primo I had where I found a black floater. I had some 19 needle filters, and decided to try them. Make a long story short, I went too fast or didn't have it on all the way, and a lot of oil came out around the needle. What a mess.
And by chance, the black thing I saw or another black floating piece landed on my finger after the oil ran down. I decided to touch it to see what the heck it was, and it disintegrated just like ash. It wasn't a solid piece like a hair or stopper, it immediately turned into black ash and left a black area on my fingers.
Anyways, thought I'd share. Whatever it was, shouldn't have been in there, regardless of how safe sym might make it sound.