Had this stuff since the pool was new last August, on the upward slope where the seam meets the slope and on the edge of a few seams on the downward slope. Nothing on the walls. From what I've read it has the characteristics of MA. So today I went in with a small food type syringe and took a sample to put in a glass, looks like fine dirt, dust, maybe skin particles, etc. I vacuumed the pool today really slow with a scum bag in the skimmer and it pretty much showed the same thing in the pic. Geographically there are pine trees to the west, oaks and maples to the east and flowering plants all around. A large park area behind me and a soy bean field next to that.
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