I have a similar experience, so riddle me this. If MirelleJoe sees more silt, or whatever, then what? I have vacuumed a couple times, but in an hour or so I see more of the substance. It's not pollen. I waited an extra month to open just to avoid the horrible tree pollen I got last year. Water is VERY clear, and was actually darn clear when I opened the pool this year. There was some heave rains, over my mesh tarp, but once I turned on the filter I began to see the silt or dirt on the bottom of the pool and in my skimmer sock.
After filtering, backwashing, etc., it seems better, but the sock still has the dirt each time. And I see it sitting on the bottom of the pool. I'll let it run for 24 hours, then vacuum and see, but I'm not hopeful.
Sand filter is 6 years old this year, never been cleaned or sand changed.