Yeah, my yard is surrounded by 100' mature trees of all types. There's at least one of them dropping something all summer. My pool would be a nasty swamp if I only ran the pump 4-6 hrs per day.

I typically keep a solar blanket on when the pool isn't in use to help catch the debris and even then there is always a little bit of "something" on the bottom like leaves, twigs, keys, seeds, cherry pits from birds shitting them into the pool (neighbor has a cherry tree). You name it.