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Acid wash or resurface, which one does your pool need?

An acid wash is cheaper and faster. Resurfacing lasts years longer. The right call depends on whether your problem is stains or a worn-out surface.

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Acid wash and resurfacing compared
Acid washResurfacing
What it doesStrips a thin layer of the old surfacePuts a brand new surface on
Fixes stainsOften, for a whileYes
Fixes roughness and cracksNoYes
Typical costAbout $0.56 to $0.68 per sq ft, a few hundred dollars for most poolsAbout $4k to $15k
How long it helpsUntil the stains come back7 to 20+ years, by finish

What an acid wash really does

The pool is drained and a diluted acid is washed over the surface to strip off a thin layer, taking the stains with it. Because each wash removes some plaster, a surface can only take a few of them before it gets thin and rough.

Acid attacks the cement in every finish, quartz and pebble included, and a newly plastered quartz pool shouldn't be acid washed at all. Ask the contractor how strong a wash they plan to use.

Where the wash water goes is regulated too. Mesa, for example, doesn't allow acid wash water into the storm drain or the sewer, and makes the owner responsible for how it's handled.

Pick an acid wash if

  1. Stains only. The surface is still smooth and the problem is discoloration.
  2. Younger plaster. The finish has years left and hasn't been acid washed several times already.
  3. Short horizon. You plan to sell soon and want the pool to look clean.

Pick resurfacing if

  1. It feels rough. Roughness means the finish has worn down, and an acid wash makes that worse.
  2. It's cracked or hollow. Cracks, hollow spots and flaking need a new surface.
  3. It's been washed before. Stains came back after an earlier acid wash.
  4. You're staying. You want something that lasts 10 years or more.

See what resurfacing costs

Where these numbers come from: Homewyse acid wash cost estimate; Leslie's on acid washing; onBalance on acid washing new quartz finishes; City of Mesa, Drain or Backwash Your Pool. Prices are ranges, not quotes.

Questions

Common questions

How many times can you acid wash a pool?

Only a few. Each wash removes a thin layer of plaster, so after several washes the surface gets thin and rough and resurfacing is the better option.

Does an acid wash make a pool smooth again?

No. It removes stains, but it can't fix a surface that has already worn rough, and it can make roughness worse.

Can a resurfacing contractor tell me which I need?

Yes. A good contractor will look at the surface and tell you if an acid wash would do. Ask them during the quote visit.

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Spring is the busy season, so winter usually has more open dates. It takes about a minute to ask.

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