Pollen

[Just Wonderin]

I know this is an odd question, but I'm trying to decide when to put in the solid carbon block filter at the faucet in our camp...we draw our water from the lake.

Every year, I see this huge wave of yellow green pollen on the lake. I wait for it to go before putting the filter in place. Putting it in too soon just clogs the filter up immediately. I didn't see that wave of pollen this year, but have to believe that it has passed. Am I right?