How Much Does It Cost to Acid Wash a Pool? [2026 Data]

In 2026, the national average cost to acid wash a pool runs between $250 and $600, with most homeowners paying between $120 and $1,500, depending on pool size and condition. Primary cost drivers include the pool's surface area, the severity of staining or algae buildup, and the surface material. Don't forget to budget for pool refilling costs after the wash is complete.

Acid Washing a Pool Cost Breakdown: What Drives the Total?

Acid washing a pool involves draining the water and treating the pool surfaces with hydrochloric acid, also known as muriatic acid. This caustic material breaks down the top layer of plaster, concrete, gunite, or aggregate to eliminate stains and organic growths. The process targets calcium, magnesium, mold, and algae buildup that standard cleaning cannot remove.

Pool Size

Your local pool service team will price an acid wash based on surface area, with costs running $0.40 to $0.60 per square foot on average, or roughly $0.50 per square foot depending on local labor rates. That measurement covers the full cleanable surface—walls and floor—not just the pool's footprint.

A pool that is 10 feet wide, 20 feet long, and 6 feet deep, for example, has 560 square feet of surface area and would cost about $280 to acid wash. Because shallow and deep ends complicate the math, have a professional measure your pool before budgeting. Here’s what you might pay to acid wash a pool based on its surface area:

Materials

Muriatic acid itself costs only about $0.06 per square foot, so the bulk of your acid wash bill goes toward tools and labor rather than the chemical. Handling muriatic acid is not for DIYers. Professionals bring the appropriate protective gear, equipment, and experience to dispense it safely.

Labor

Pool maintenance costs run $80 to $200 an hour, and an acid wash averages four hours of work. Many professionals charge a flat fee for smaller jobs to cover travel and overhead rather than billing strictly by the hour.

Stain Severity

The type of stains in your pool directly affects how long the acid wash takes and what the job ultimately costs. Mineral and metal stains from iron, nickel, and calcium buildup require significantly more scrubbing than organic growths like algae. Ask your pro to assess stain severity before scheduling so you get an accurate time and cost estimate.

Pool Surface

Muriatic acid washing is only suitable for exposed aggregate surfaces such as concrete, plaster, pebbles, and other large aggregates. Fiberglass and vinyl pools require the much gentler ascorbic acid instead, which is a viable DIY option with cleaning solution costing between $30 to $50. 

Confirm your pool's surface material with a pro before scheduling any acid wash treatment.

Tipping

Tipping your pool maintenance team is an increasingly common way to recognize hard work. A tip of $10 to $20 per team member, or 10% to 20% of the total bill, is a reasonable and appreciated gesture.

Why You Should Hire a Pool Maintenance Pro

Labor makes up the bulk of the cost to acid wash a pool. While you can purchase the materials affordably to acid wash the pool yourself, working with those materials without experience can be dangerous. Instead, hire a local pool maintenance pro to acid wash it for you.

Here's why it's ideal to hire a pool maintenance pro

Working with a professional pool contractor to acid wash your pool is the better option because:

• Working with hydrochloric acid (muriatic acid) is dangerous if you're not careful.

• A professional can recommend other treatment options if acid washing isn't the right fit.

• Acid washing a pool can be monotonous and time-consuming.

• Pool maintenance pros may notice other issues they can repair while your pool is already drained.

If you want to DIY acid wash your pool

While you can theoretically acid wash a pool yourself by purchasing the materials, it can be dangerous if you're not experienced. Instead, here are some elements you can handle to reduce labor costs:

• Drain the pool yourself and remove all debris.

• Refill the pool after it's been acid-washed to avoid the cost of refilling a pool.

6 Tips for Reducing the Cost of a Pool Acid Wash

There are ways to prep your pool and refill it on your own to lower labor costs for acid washing a pool. You can also time your acid pool wash to avoid the high season. Here are six tips to keep acid pool wash costs down.

1. Avoid the high season in the late spring and summer

2. Drain the pool yourself and remove any physical debris from the walls and floor

3. Stay on top of pool maintenance and repairs to avoid additional work before the wash

4. Refill the pool on your own

5. Chat with at least three pool maintenance teams to compare prices

6. Consider packaging the acid wash when hiring a pool maintenance team

How Angi Gets Its Cost Data

Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We extensively research project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We rely on reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects. 

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