What about pollen??

[chem geek]

Have you considered using skimmer socks? They usually catch pollen that stays on the surface long enough to get to the skimmer. You can even use panty hose if you don't want to spend money on skimmer socks from a pool store. They go over the skimmer (on the inside, not the outside), pushed down so you can still trap larger objects in the basket itself.

[Poconos]

tcannon,
Welcome to the forum.
You may also try adding a little DE powder to the filter. Kind of turns a sand filter into a DE filter that traps much smaller stuff.
Here is the link:
http://www.poolforum.com/pf2/showthr...to-sand-filter
It's a cheap solution.
After you add the stuff just keep an eye on the pressure because if it's catching a bunch of pollen the pressure will rise rapidly and need a backwash. You also don't have to do a long backwash, maybe a minute should do to get rid of the bulk of the trapped stuff. Then a 10 second rinse after the BW.
Al