Just a thought for you. My pool is under a large live oak canopy and when I first moved in the water was never completly crystal clear. I too thought it was pollen because I had repeatedly shocked it in addition to running the SWC at a high level. I was finally convinced here to run the Cl levels up high and keep them there for a few days until it reslolved, all the while vaccuming daily. That did the trick and I've been a believer since. Now if ever there is a water clarity problem, that has worked for me. It's a cheap, easy fix. Also probabaly you aren't swimming much yet, so it's a good time to tie up the water for a few days and get it ready for the season.