Debris load goes up before demand goes down
Live oaks, pecans, cedar elms, and crepe myrtles all drop at different times through fall and into winter, so there isn't one leaf week to plan around — there's a long stretch of it.
Baskets fill faster, cleaner bags load up quicker, and filter pressure climbs sooner. Emptying skimmer and pump baskets between visits is the single most useful thing an owner can do in the fall, and it protects the pump more than any chemical does.
Organic debris left on the floor also stains. Leaves, acorns, and berries sitting on plaster overnight can leave marks that outlast the leaf itself.
Run time follows the water temperature down
As water cools, the pool needs fewer turnovers per day. Run time should come down through fall in steps rather than staying at the summer schedule until January.
There's a floor, though. Run time still has to be long enough to clear debris, skim the surface, and turn the water over at least once. Cutting it too far in leaf season leaves debris sitting and pressure climbing.
The maintenance worth doing now
Fall is the right time for a filter clean, because the element goes into leaf season clean rather than already loaded. It's also a good window for a salt cell clean and for checking your cleaner's wear parts before they're buried in debris.
If your equipment has freeze protection, fall is when it gets tested — not the night of the first cold front.
Chemistry in the shoulder season
Chlorine demand drops as the sun weakens, but decomposing organic debris eats chlorine, so demand doesn't fall as fast as owners expect. A pool that's suddenly holding less chlorine in October is usually telling you there's more in the baskets and on the floor than you think.
Cooling water also starts pulling LSI negative, so balance targets shift through the season rather than staying at summer numbers.
