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Safe PSI for travertine, concrete, and pavers — plus how to protect your pool, remove algae properly, and know when to seal after washing.
A pool deck in South Florida lives a harder life than almost any other horizontal outdoor surface. It's baked by sun, soaked by rain, hit with constant pool splash and splash-back, and exposed to bare feet, sunscreen, pool chemicals, and the year-round humidity that makes Florida's climate so hostile to clean surfaces.
Florida's summer combination — heat above 90°F, humidity above 80%, and daily afternoon rain — creates perfect conditions for green and black algae to colonize a pool deck in a matter of weeks. The porous surface of travertine and natural pavers provides microscopic footholds for spore germination. Once established, algae becomes a genuine safety hazard. A wet travertine deck with a light algae film is as slippery as ice. Black algae (actually a cyanobacteria) embeds its roots deep into porous stone and is notoriously difficult to remove with pressure alone.
Travertine is the dominant pool deck material in South Florida — walk through any neighborhood in Boca Raton, Coral Gables, or Weston and you'll see it everywhere. It's beautiful, cool underfoot, and naturally slip-resistant when clean. But it's also a porous limestone-based material that stains easily, absorbs pool chemicals and sunscreen, and is easily damaged by high pressure washing or acidic cleaners. Its natural voids (the holes in the stone) trap algae, dirt, and calcium deposits from pool splash, creating a maintenance challenge that most homeowners underestimate.
Every time pool water splashes onto the deck and evaporates, it leaves behind a trace of dissolved minerals — calcium carbonate, magnesium, and whatever chemicals are in the pool water. Over months and years, these deposits build up as a white haze or hard scale on the deck surface, particularly along the pool edge and the first few feet of deck adjacent to the water. This mineral buildup requires chemical treatment (an appropriate pH-neutral or mildly acidic mineral remover) in addition to pressure washing to fully remove.
Using the wrong pressure setting is the most common and most damaging mistake in pool deck washing. The matrix below covers the three most common South Florida pool deck surfaces.
| Surface Type | Recommended PSI | Nozzle | Wand Distance | Risk Level |
|---|---|---|---|---|
| Travertine | 1,200 – 1,500 PSI | 40-degree (white) | 10–14 inches | Gentle Only |
| Natural Pavers (brick, tumbled stone) | 1,500 – 2,000 PSI | 25-degree (green) | 8–12 inches | Moderate |
| Concrete / Kool Deck | 2,000 – 2,500 PSI | 25-degree (green) | 6–10 inches | Standard |
| Poured Concrete (bare) | 2,500 – 3,000 PSI | 25-degree (green) | 6–8 inches | Do Not Exceed |
Remove all pool furniture, floats, toys, potted plants, and accessories from the deck. Lower the pool water level by 2–3 inches if feasible by using the waste or backwash setting on your pool's multiport valve — this creates a margin between the pool water surface and the deck edge, reducing the amount of wash water and chemical that enters the pool during cleaning.
Place the pool skimmer basket in the skimmer opening to catch debris that may fall or wash in during cleaning. If you have a pool cover, deploy it. Protect pool equipment (pump housing, filter, heater) with plastic sheeting if they're close to the deck area.
Put on safety goggles and closed-toe shoes. Pressure washing pool decks produces debris-laden water spray that ricochets at unexpected angles, especially off pavers and tile edges.
This is the step that separates a good result from a great result. Applying an algae-specific deck cleaner or a diluted sodium hypochlorite solution (1–2% SH, well below standard soft wash strength) to algae-covered areas before pressure washing breaks down the biological growth at its root structure. The chemistry does the heavy lifting; the pressure washer finishes the job.
Apply the pre-treatment with a pump sprayer or garden sprayer, working it into the surface with a push broom. Allow 10–15 minutes of dwell time. You'll see the green color oxidize and fade — this is the chemistry killing the algae. For particularly stubborn black algae spots, scrub vigorously with a stiff-bristle deck brush after applying the cleaner and before pressure washing.
For calcium and mineral deposits near the pool edge, use a pH-neutral mineral remover per manufacturer instructions. Do not use muriatic acid on travertine or natural stone — it will etch and permanently damage the surface.
Pro Exterior pressure washes pool decks throughout South Florida — travertine, pavers, and concrete — with surface-correct PSI and proper pool protection every job.
View Our Pressure Washing ServiceAttach the appropriate nozzle for your surface type based on the table above. For travertine and most natural stone, the 40-degree (white) nozzle is mandatory — it creates a wide, gentle fan of water that covers a broader area with lower concentrated force at any given point. Resist the temptation to switch to a 25-degree nozzle to speed things up on travertine. The time you save is not worth the surface damage.
Test your settings on an inconspicuous area of the deck first — the corner furthest from the pool, behind a furniture leg placement area. Watch for surface erosion or grout disturbance before committing to the full deck. If you see the surface eroding, increase your wand distance or reduce your pressure.
Consider using a surface cleaner attachment (a rotating disc that holds two nozzles) for large flat deck areas. Surface cleaners wash more evenly than a single wand, prevent the "striping" pattern that a wand leaves on concrete, and work faster on large surfaces. However, use them cautiously on travertine — they can be too aggressive if the PSI isn't dialed down properly.
This is the most important operational rule of pool deck washing. Every pass of the pressure washer should direct water away from the pool — toward the deck's perimeter, into drains, or toward the yard. Never point the wand toward the pool or let wash water cascade over the pool edge in quantity.
Work in sections, starting at the far end of the deck (furthest from the pool) and working toward the pool edge last. This way, the dirtiest, most chemical-laden water is already flowing away from the pool by the time you're working near the water. Move laterally across the deck in consistent overlapping strokes, keeping the wand at a consistent height and angle to avoid uneven cleaning lines.
When you reach the pool coping (the stone or tile cap at the pool edge), reduce pressure further and keep the wand well back from the edge. The gap between coping and pool tile is a direct pathway for water and debris into the pool.
After pressure washing, do a final rinse of the entire deck surface with a garden hose to flush any remaining cleaning chemical residue and loose debris to the perimeter. Remove the skimmer basket and clean any debris that collected there. Check your pool water — test and adjust chlorine, pH, and alkalinity as needed since even small amounts of cleaning solution that made it into the pool can temporarily affect water chemistry.
Allow the deck to dry completely before applying any sealer. In South Florida's humidity, "completely dry" means a minimum of 24 hours — ideally 48 hours — of dry weather with no rain and no pool splashing. Applying sealer to a damp surface traps moisture under the coating, which causes the sealer to peel or cloud.
Pressure washing a pool deck opens the pores of the stone, removes old sealer (if any was previously applied), and leaves the surface more porous and vulnerable than it was before washing. This is the ideal moment to apply a penetrating sealer — and it's also the most commonly skipped step.
For travertine and natural stone pool decks, use a penetrating/impregnating sealer specifically rated for wet outdoor use. Avoid topical/film-forming sealers (they peel in Florida's UV and heat). Look for products labeled for natural stone, pavers, or travertine — the active chemistry is usually a silane-siloxane or fluoropolymer that bonds to the stone's mineral structure from within rather than coating the surface.
For concrete pool decks, both penetrating and topical sealers are appropriate. A topical acrylic sealer on concrete can also restore the appearance of Kool Deck or colored concrete coatings. Apply per manufacturer instructions and reapply every 1–3 years depending on traffic and UV exposure.
Pool deck washing mistakes can be expensive — damaging stone that costs $15–$30 per square foot to replace, or disrupting pool chemistry that requires expensive treatment to correct. Here's what to avoid: