How big is your pump?
How much is "completely covered the next day?" It is pretty common for some dirt to get stirred up into suspension while you are vacuuming. Then, once the water quiets down, the dirt resettles back on the floor. I see this in my own pool. The dirt wants to resettle in the lines created by taping the foam pad together that is underneath the liner. Do you think this could be what is happening in your pool?
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