Weird black residue on pool surface

Apr 24, 2014
18
Oklahoma
Pool Size
13000
I noticed a couple days ago that there is a weird black residue floating on the pool. It looks and feels like the scrapings from a scratch off lotto ticket. I have no clue what is is or where is came from, and I can’t seem to get it sucked up with the skimmer or the net.
 

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