Florida pools fight two seasonal surges that most homeowners never see coming. Spring delivers pine and oak pollen by the bucketload; fall delivers algae blooms driven by warm water, rain dilution, and decaying organics. Both are predictable. Both are manageable if you adjust the service plan ahead of them instead of reacting after.
Spring: the pollen wave
Peak pollen in Central and South Florida runs from late February through April, depending on the year. The two big offenders for pools are:
- Pine pollen— yellow, fine, powdery. Coats everything within a 100-ft radius of the source tree. Not a chemistry issue directly, but physically overwhelms filters.
- Oak pollen (catkins)— worm-like string clusters that drop into pools in mats. Tannic acid stains plaster and clogs skimmer baskets.
During pollen season a cartridge filter can go from clean to fully loaded in 3 days. Service adjustments:
- Hose cartridge filters twice per service visit. Deep-clean (overnight soak in filter cleaner) every 4–6 weeks until the season ends.
- Add a DE “helper charge” to cartridge filters — a small scoop of DE powder dusted into the skimmer fines the filter without needing to replace media.
- Run the pump longer. During peak pollen, add 2–4 hours per day to move the load through the filter.
- Brush the waterline tile weekly. Pollen deposits on the tile are the primary source of post-season scum line.
Fall: post-rain algae pressure
September and October are the algae-fight months in Florida. Water is still warm (83–87°F), afternoon thunderstorms dump rain that dilutes sanitizer and stabilizer, and the first cool nights slow chemistry response. Algae blooms that wouldn't survive July conditions take hold in October.
- Maintain slightly elevated free chlorine (3–4 ppm) during fall to give the pool a buffer against rain dilution.
- Watch CYA. A summer of topping off has often pushed it high; a couple of heavy rains can drop it to below-effective levels overnight.
- Pre-empt with algaecide. A weekly polyquat dose during September–October prevents most green blooms before they start.
- Brush aggressively. Walls, steps, waterline, and the corners that the main drain doesn't sweep. Mechanical removal beats chemistry for early-stage blooms.
What to flag to homeowners proactively
- “Your filter will need to be cleaned more often next month” — sets expectations before the trip charge.
- “The pool may look slightly dusty on the surface for a few weeks” — acknowledges pollen without triggering a complaint call.
- “We're going to run extra chlorine in September — expect the test strips to read higher than usual” — prevents the “is the pool safe?” question after a homeowner tests it themselves.
Routine adjustments, not reactive emergencies
Every route has two or three pools that get algae every October because their owners won't pay for the extra filter cleaning or won't accept the chlorine bump. The solution is documentation: note the pattern in the service notes, quote the extra work when you see the signs, and treat the conversation as budget planning instead of a sales pitch. “Last year we fought green here for three weeks. This year I want to start the September protocol early.”
Pollen and fall algae are seasonal taxes on Florida pool service. Paid in advance with proactive filter work and chemistry adjustments, they cost a fraction of what they cost paid reactively after a bloom takes hold.