You can find out if it sand or a fine silt easily. Stir up the water near it with a net or something. If it disperses easily it's silt. Sand will settle right out again. Or, go down and see if you can pick some up with your fingers or just rub it. Sand will be gritty, you won't even feel the silt. I call it silt as it could be from your fill water or even pollen during the right season. It may be so fine it goes right through the filter. Some of us put a little DE powder in the filter to trap finer stuff. Identify what the stuff is first then we'll go from there.
Couple other things...after you backwash do you do a 'rinse' for a few seconds before switching to 'filter'? Also, what make/model filter and pump size? Have to make sure the pump and filter are sized correctly.
Al
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