Pool Acid Wash
A stained pool is not always a resurfacing job. Usually it is a wash.Starting at $750–$2,200 per acid wash — flat-rate pricing, free on-site inspection, no contracts.
What Acid Wash includes
An acid wash removes a thin layer of stained or scaled plaster and gives you back the surface without the cost of resurfacing — roughly a tenth of the price on a pool whose plaster is still structurally sound. We inspect first, because the honest answer is sometimes that you do not need one, and sometimes that you need resurfacing instead. When it is the right call we handle the whole sequence: permits and water disposal, the drain, the wash, neutralizing the runoff, refill, and the 28-day plaster startup that decides whether the refresh lasts five years or one.
- ✓Pre-wash inspection — confirming the plaster is sound enough to wash rather than resurface
- ✓Drain permitting and wastewater neutralization where the municipality requires it
- ✓Water-table and drain-timing assessment before the pool comes down
- ✓Controlled drain, then a full rinse and second inspection of the empty shell
- ✓Sectioned acid wash, top-down, rinsed section by section
- ✓Soda-ash neutralization of all runoff, with pH tested before discharge
- ✓Refill coordination from a single source at a controlled rate
- ✓The 28-day plaster startup protocol — daily brushing, no shock, managed pH and alkalinity
South Florida pool owners with embedded algae or mineral staining, uniform discoloration, or post-green-pool stain ghosting on plaster that is still structurally sound — no widespread cracking, delamination, or exposed aggregate.
What to expect: our acid wash
Done correctly this is one to two days of wash plus a 28-day startup. Done incorrectly it permanently damages plaster, and the damage is not reversible. The two places it goes wrong are the drain and the startup — not the wash itself.
- 1Inspect before anything is promised
We confirm the plaster is structurally sound first. Widespread cracking, delamination, or aggregate already showing through means an acid wash will accelerate the failure rather than fix it, and the honest answer is resurfacing. This is also where a fair number of pools get told they do not need a wash at all — a stain that responds to chemistry should be treated with chemistry.
- 2Handle permits and plan the water
Some Florida municipalities require a permit to drain a pool to storm drainage, and many require the acid wastewater be neutralized before discharge. That gets sorted before the pool comes down, not after.
- 3Time the drain to the water table
This is the step that matters most here and the one a cheap crew skips. South Florida sits on a high water table, and an empty shell is a boat. We have seen pools pop four inches out of the ground during summer drain attempts on canal-front and barrier-island lots. We check the table, use the hydrostatic relief valve, and pick the timing — a popped pool turns a $1,500 job into a rebuild.
- 4Rinse and re-inspect the empty shell
An empty pool tells you things a full one cannot. We rinse, clear debris, and look again for cracks or hollow spots the water was hiding before any acid touches the surface.
- 5Wash in sections, top-down
Diluted muriatic acid, applied in four-to-six-foot vertical stripes from the waterline down, scrubbed briefly, and rinsed immediately before moving on. Working in sections is what keeps the etch even — letting acid dwell while you work elsewhere is how pools end up striped.
- 6Neutralize everything before it goes anywhere
Soda ash across the floor and any standing runoff, then we test the pH of the wastewater before it discharges. This is a legal requirement in much of the region and a decency one everywhere.
- 7Refill and run the 28-day startup
Fill from a single hose at the deep end at a controlled rate, then the full plaster-startup protocol — daily brushing the first week, no shock for 28 days, careful pH and alkalinity while the surface cures. This window is the whole ballgame: it decides whether your refresh lasts five years or one.
Acid Wash — Common Questions
A typical residential acid wash runs $750–$2,200, driven by pool size, how deep the staining has set, and refill logistics. For comparison, that is roughly a tenth of what full resurfacing costs ($8,000–$30,000), which is the whole reason acid wash is worth doing on a pool with sound plaster. If draining is risky or the staining is mild, a no-drain chlorine bath runs $500–$900. We quote flat-rate after seeing the pool, because the difference between a wash and a resurface is a judgement made standing over it.
There is a no-drain option and it is a chlorine bath, not an acid wash — a strong chlorine treatment applied to the surface with the pool still full, running $500–$900. It handles mild surface staining and organic ghosting. It will not touch embedded mineral staining or uniform discoloration, which need the pool empty and the plaster physically etched. On canal-front and barrier-island properties where the water table makes draining genuinely risky in summer, a chlorine bath is often the right trade even when it does less.
It can be, and this is not a theoretical risk. Much of this region sits on a high water table, and an empty pool shell has nothing holding it down against groundwater pressure — it floats. We have seen pools pop four inches out of the ground during summer drain attempts. A crew that knows the area checks the water table, opens the hydrostatic relief valve, and picks the season. A crew that doesn't drains fast and hopes. That is why we time the drain rather than just scheduling it.
Every wash removes a thin layer of plaster, so this is a budget you spend down. A traditional plaster pool tolerates roughly three to five acid washes across its life before it needs resurfacing — often 30 to 50 years of pool if the rest of the care is right. Aggregate finishes like Diamond Brite and Pebble Tec tolerate fewer, because each wash exposes more aggregate. Practically, most pools that need one need it every 5–10 years, and it should be driven by how the surface actually looks, not by a calendar.
Three reasons, all local. Our fill water comes out of the Floridan aquifer at 200–450 ppm calcium hardness from limestone leaching, so scale forms across the plaster faster. Year-round UV drives algae spore pressure 365 days a year, so stains set deeper and quicker than they do in a climate with a real off-season. And storms do in a weekend what normally takes years — blown organic debris plus chlorine depletion during a power outage can embed staining in plaster over a single hurricane. Post-storm acid washes are a regular part of our year.
Look at whether the problem is cosmetic or structural. Widespread discoloration, embedded algae stain, or mineral staining on a surface with no cracking and no delamination is a wash — and it buys you five to ten more years before resurfacing. Cracking, hollow or delaminating spots, or plaster already etched down to aggregate is a resurface, and washing it will make it fail faster. We give you that call in writing after the inspection, and we would rather tell you to spend nothing today than sell you a wash that shortens your surface's life.
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