St Augustine and the surrounding St Johns County area has a lot of pools — and with pools come pool decks that spend most of the year wet, under Florida sun, and exposed to the biological growth that thrives in exactly that environment. Whether the deck is concrete, travertine pavers, brick, or interlocking concrete pavers, it is going to need cleaning. The method, however, depends entirely on the surface.
Why pool decks get dirty faster than other surfaces.
Pool decks sit in one of the most growth-friendly environments on a Florida property. The constant splash and splash-back from the pool keeps the surrounding surface damp far more often than a driveway or sidewalk. That moisture, combined with direct sun that alternates with shade from a pool cage or screen enclosure, creates ideal conditions for algae, mildew, and mold. Pool decks in St Augustine neighborhoods like World Golf Village, Palencia, and the areas of St Johns County near the Intracoastal can also accumulate pollen and organic debris from surrounding tree cover year-round.
Beyond appearance, a dirty pool deck is a safety concern. Algae and mildew make wet surfaces slippery. A pool deck that has not been cleaned in a season or two can become genuinely hazardous when wet, especially for children and older adults who use the space most. Regular cleaning is maintenance, not just aesthetics.
Concrete pool decks: what works and what to watch.
Concrete pool decks — including brushed concrete, exposed aggregate, and cool deck-style finishes — respond well to pressure washing when done correctly. The key is using the right PSI for the finish type and keeping the wand or surface cleaner moving evenly to avoid etching or leaving concentrated pressure lines on the surface.
Cool deck and similar textured coatings are more sensitive than plain concrete and need a lower pressure setting to clean without damaging the coating. Exposed aggregate is more durable but has irregular surface texture that traps organic debris and can take more dwell time with cleaning solution to release buildup from the pockets. Plain brushed concrete typically handles surface cleaner pressure washing well and results in the most dramatic before-and-after difference because the staining tends to be uniform and lifts cleanly.
For concrete pool decks with heavy algae near the waterline edge or in shaded corners, a pre-treatment with a soft wash solution before pressure washing helps ensure the organic growth is treated, not just physically displaced. This reduces the likelihood of fast regrowth on the treated surface.
Paver pool decks: lower pressure, smarter process.
Paver pool decks — whether travertine, brick, or interlocking concrete pavers — are the most common pool deck surface in newer St Augustine and Nocatee construction, and they require a different approach than concrete. The reason is joint sand. Pavers are held in position by the compacted sand filling the joints between them. High-pressure washing aimed directly at joints can displace that sand, which causes pavers to shift, rock, or sink over time. Once the joint structure is compromised, the deck's stability is affected.
For paver pool decks, the correct approach is lower pressure — sometimes soft wash pressure — combined with an appropriate cleaning solution that treats the algae and mildew rather than just blasting the surface. This lifts the growth without disturbing the joint sand, and the result looks just as clean as a high-pressure treatment on concrete.
When paver pool decks need sealing too.
After a paver pool deck is cleaned, many homeowners opt to re-sand and seal the surface at the same time. This makes sense because the cleaning is already done, the pavers are at their best condition to accept sealer, and sealing while the joints are fresh protects the deck for the next two to three years. Sealed paver pool decks resist algae and mildew penetration better, are easier to rinse clean during the pool season, and hold their color against UV fading significantly longer than unsealed pavers.
The sealer choice for pool deck pavers matters. Wet-look sealers that look great on a driveway can become slippery when wet on a pool deck — which is the opposite of what you want. For pool deck pavers, a matte or natural-look sealer with a non-slip additive is typically the right call. Kolby walks through the options at quote time so the finish is appropriate for the surface location. More on the full process is available on the paver sealing page.
Travertine pool decks: the most delicate surface.
Travertine is a natural stone that is popular for pool decks in St Augustine, Ponte Vedra, and higher-end St Johns County homes because of its natural appearance and the way it stays cooler underfoot in direct sun than concrete or brick. It is also the most sensitive pool deck surface to clean incorrectly. Travertine is porous and can be damaged by acidic cleaners, etched by high pressure, or stained by the wrong cleaning chemicals.
Travertine pool decks should always be cleaned at low pressure with a pH-neutral or very mildly alkaline solution that treats the organic growth without reacting with the stone. Acid-based cleaners — sometimes used for rust removal on concrete — should never be applied to travertine without specific product guidance, as they can cause etching and permanent surface damage. If travertine has mineral deposits from pool water or irrigation, a specialist stone cleaner is the appropriate treatment rather than a generic concrete product.
How often do pool decks in St Augustine need cleaning?
Most pool decks in Northeast Florida benefit from at least one professional cleaning per year. Heavily shaded decks or decks adjacent to landscaping with significant organic debris may need attention twice a year — once before peak pool season in late spring, and once in the fall after summer growth and storm debris season. Sealed paver decks can often go longer between deep cleanings because the sealer prevents growth from penetrating the surface, but they still benefit from an annual walkthrough.
If the pool deck connects to other surfaces that also need attention — the driveway, house siding, or screen enclosure — bundling those into the same service visit is the most efficient approach. See the St Augustine exterior cleaning page for the full range of services available in that area.