I have a problem with very fine dirt settling on the bottom of my pool. The water is crystal clear until we swim a lot and it stirs up the dirt on the bottom. My Polaris 280 gets a good bit of the sandy stuff but this dust just gets stirred up and then settles back out. I've tried vacuuming it but it is so fine and "lightweight" that I end up disturbing most of it instead of sucking it up. Is this indicative of a filter problem or something? I would think the sand filter would get it out but maybe it doesn't get stirred up enough to get in the skimmer. Any tips, tricks, suggestions greatly appreciated.