We have had lots (and lots and lots) of pollen this year, first the yellow stuff and now the tiny brown stuff (not powdery like the yellow stuff). Culprits are live oaks and pines, I think. My pH dropped from 7.6 to 7.4. It has never dropped since we've owned the pool. We usually have to watch it and add MA from time to time (but much less frequently with the 2 year anniversary of the pool fill coming up soon). Is it possible that the pollen is acidic enough to drop the pH a bit? Chlorine is fine, no CCs. Pump is running most of the time to keep the temp where I want it for swimming.