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