My composite roof sheds little bits of grit when it rains, and some end up on the patio, and some of those end up in the pool. There's an annoying sand drift in the spa when everything settles down. It's not a lot, I could probably count the bits if I was patient. The vacuum won't pick them up. I attacked them directly with the vacuum hose and they moved, but didn't get sucked away. They appear to be too dense or something.
Does anyone have any ideas how to remove this stuff? I don't relish the thought of diving with a pair of tweezers to clean things 100%.