Pool Services In Elkhart, IN
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Gunite/Marcite Pool Acid Washes

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Gunite and marcite are two of the most popular materials for the interior surfaces of home swimming pools. Gunite is a mixture of cement and sand. Marcite is also known commercially as plaster or whitecoat, and it may or may not include quartz. Both gunite and marcite pools can by cleaned by a technique called acid wash. Acid washing your pool can remove algae, chemical stains, and mineral deposits.

In order to acid wash your pool, you must have all the water in your pool removed. Elkhart Pools can drain your pool safely, as can the water company in your city. Do not attempt to drain all the water from your pool by yourself, even if you are experienced at making repairs. At Elkhart Pools, we are happy to perform the acid wash for you, from beginning to end, but if you prefer to do it yourself once you have had the water drained, you can come to us to get the necessary supplies.
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​If you do your own acid wash, it is important to wear appropriate safety gear, including a breathing mask, goggles, rubber gloves, and slip-proof boots. First, scrub the walls and floor of the pool with a brush to remove the visible debris. Next, pour a gallon of water and a gallon of muriatic acid into a bucket, and keep adding one gallon of each until the bucket is almost full. Pour a small amount of the acid solution on the wall to test it. If it has enough acid, it will bubble on contact; if it does not bubble, add more acid to the solution, one cup at a time. Pour the acid from the top of the wall and scrub the wall with a brush. When the acid runs down to the bottom of the pool, neutralize it by adding two pounds of soda ash per gallon of acid. Finally, pump the mixture of acid, water, and soda ash out of the pool. Then rinse the pool several times with a hose and pump the rinse water out of the pool. After you have done this, you are ready to have your pool refilled with water. You may wish to resurface the pool with gunite before you refill it with water. Be sure that the pH of the water, as well as chlorine and acid levels, are appropriate for swimming before anyone uses the pool.

If your pool has a marcite lining, the acid wash process is similar to the one used for pools with gunite linings. If your pool has a vinyl lining, do not acid wash it, as this will damage the vinyl. To remove algae and stains from the vinyl lining of a pool, use detergents designed specifically for vinyl pool linings. It is also not necessary to drain all the water from a vinyl-lined pool when cleaning it. If the vinyl lining of your pool will not get clean, even when you scrub it with the appropriate cleaning products, it is necessary to replace the vinyl lining.

​Gunite/Marcite Pool Acid Washer FAQ

Keeping a gunite or marcite pool clean and attractive requires more than routine brushing and chemical balancing. Over time, mineral deposits, stains, algae, and other buildup can make a pool surface look dull or discolored. At Elkhart Pools in Elkhart, Indiana, professional gunite/marcite pool acid washing can help restore the appearance of your pool and prepare the surface for another season of swimming.
Below are answers to frequently asked questions about this specialized pool cleaning service.
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What Is a Gunite/Marcite Pool Acid Wash?

A pool acid wash is a deep-cleaning process designed primarily for plaster-based surfaces such as gunite and marcite. A controlled acid solution is applied to the pool surface to remove certain stains, discoloration, mineral buildup, and algae that normal cleaning may not eliminate. Because acid washing involves chemicals and can affect the pool surface, it should be performed carefully by experienced professionals.

When Should I Have My Gunite or Marcite Pool Acid Washed?
An acid wash may be appropriate when your pool has stubborn stains, significant discoloration, algae buildup, or mineral deposits that remain after regular cleaning. It can also be considered when opening a neglected pool or when routine maintenance is no longer producing the desired appearance. Elkhart Pools can evaluate the condition of your pool and help determine whether an acid wash is appropriate.

Can Acid Washing Remove Pool Stains?

Acid washing can remove or reduce many types of surface stains, including some mineral deposits, algae-related discoloration, and organic staining. However, not every stain responds to an acid wash. The source, depth, and type of staining all matter. A professional evaluation can help establish realistic expectations before the service begins.

Is Acid Washing Safe for Gunite and Marcite Pools?

When performed correctly, acid washing can be used on compatible gunite and marcite pool surfaces. However, acid is a strong chemical and improper application can damage pool plaster or create uneven results. Professional handling, proper preparation, and appropriate safety procedures are important for protecting both the pool surface and surrounding property.

How Often Does a Pool Need an Acid Wash?
There is no universal schedule for acid washing. Many pool owners only need this service occasionally, depending on water chemistry, maintenance habits, staining, and the condition of the plaster. Acid washing too frequently can unnecessarily remove a small amount of the pool's plaster surface, so it should generally be treated as a specialized cleaning service rather than routine maintenance.

Will Acid Washing Make My Pool Look New Again?
An acid wash can significantly improve the appearance of a stained or discolored pool, but results depend on the condition of the existing surface. It will not repair cracks, major surface deterioration, structural problems, or severe plaster damage. If the pool surface is aging or deteriorating, resurfacing may be a better long-term solution.

Why Choose Elkhart Pools for Pool Acid Washing?

Elkhart Pools understands the needs of swimming pool owners in Elkhart, Indiana, and the surrounding area. Professional assessment and careful cleaning can help protect your gunite or marcite pool while improving its overall appearance. If your pool has stubborn stains or discoloration that regular maintenance cannot resolve, contact Elkhart Pools to discuss whether a professional acid wash is the right solution for your pool.

Contact Us

Elkhart, IN
(574) 607-4730
[email protected]

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