Sand is getting into the pool whan the filter is running.
Have you tried backwashing recently? If so, I would first check to make sure that your pool filter is on the "filter" setting and has not been changed. Next, i would evaluate your filter pressure to make sure that it is at an acceptable level. Finally, check your sand. If it is extremely dirty or has not been replaces in a long time, it might be time for fresh, more effective sand.
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