Algae problem starting?

Gee, I just can't tell from the video. While your water looks very clear, if what you are seeing when you brush is a light green plume of dust, then it probably it algae. If it's slightly brown, it could just be dust that settled. I think it's too late in the year to be pollen. If still in doubt, you can post a full set of numbers for us to compare more specifics. Hope that helps.
 
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