Everybody struggles with pollen in the spring in the NE. Here's what I do until the pollen season passes:
1) Keep the filter running 24/7.
2) Backwash regularly.
3) vacuum AND BRUSH regularly
4) Use a skimmer sock. It will catch more pollen than your filter will. You may have to clean it 2 or 3 times a day.
5) Keep your chlorine up.
6) Use a solar cover when you aren't swimming. You'll probably have to hose it off as you roll it up, but that pollen's better on the ground than in your water.
7) Don't add a bunch of chems hoping they will fix it. They won't--they'll just make it worse.
8) POPP--Pool Owner Patience and Persistence.