I don't know if your problem is solved but it all happened to me as well.
Mine was pollen silt...I put 1 cup of DE in my skimmer (I have a sand filter) moved the water for a couple of days steady TA-DA it's gone.
I will warn you though backwash everyday because if you don't the silt will still be your sand and blow right back in. The other thing is your pool will be cloudy for awhile if you don't put clarifier in there pretty quick.
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