Leo Martínez
Maintaining a swimming pool can be a lot of work, especially when it comes to removing tough stains. Acid-washing is a popular method for cleaning and restoring the appearance of a pool, but it can be a hazardous activity if not done carefully. The process involves using a mixture of water and acid to scrub away a thin layer of the pool floor or wall, revealing a bright, new surface underneath. It is important to note that acid-washing is not suitable for all pool surfaces and can damage vinyl, fiberglass, acrylic, or painted pools. In addition, it is crucial to take the necessary safety precautions when working with acid and to neutralize any acid residue before disposing of it. Once the pool is clean and dry, it can be repainted, but this requires careful planning and preparation to ensure a good finish.
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What You'll Learn
Preparing the pool surface
Firstly, assess the condition of your pool surface. If your pool has a pebble, plaster, or quartz surface, it is generally safe to proceed with acid washing. However, if your pool is vinyl, fiberglass, acrylic, or already painted, acid washing is not recommended as it can cause damage. Consider the number of times your pool has been painted before and whether the surface is suitable for repainting or needs to be stripped back.
Next, ensure your pool is empty and free of debris. If your pool does not have a hydrostatic valve and the water table is high, do not empty the pool. Wait until the water table falls to avoid potential damage. Once your pool is empty, begin the cleaning process. A jet wash is ideal for the initial cleaning to remove stubborn surface contamination. Use a mild detergent to eliminate surface scum, algae, and dirt residue. This will help you better evaluate the surface condition.
After the initial cleaning, it's time for the acid wash. Using a garden sprayer, apply the acid wash cleaner to a lightly dampened surface, working in small sections at a time. It is important to wear protective clothing, goggles, a mask, gloves, and boots when working with acid. Once the acid is applied, work it into the surface with a stiff broom and let it sit for 10 to 15 minutes. Pay special attention to the water line and the top 12 inches of the pool sides, as oily residue builds up in these areas, causing paint blistering. Rinse the acid-washed section thoroughly with plenty of fresh water before moving on to the next section.
After acid washing the entire pool, give it a final rinse. Once the pool is clean, address any necessary surface repairs, such as tiling and crack repairs. If you don't feel confident tackling these repairs yourself, consider hiring a professional tradesman. Ensure that all loose and flaking paint is scraped back, and then sand all surfaces using abrasive paper (P80 or P120). Wash the sanded surfaces with fresh, clean water and allow the pool to dry completely, which can take up to 3 to 5 days depending on the weather.
By thoroughly preparing the pool surface, you will ensure a smoother painting process and a more durable finish. Remember, the more time and care you invest in surface preparation, the better the final result will be.
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Using the correct acid
Muriatic acid is often used for acid washing pools, but it is a hazardous substance. Always wear protective gear, including clothing, goggles, a mask, gloves, and boots, when working with any type of acid. Additionally, acids can be harmful to the environment, so it is crucial to neutralise and properly dispose of any wastewater.
When preparing the acid mixture, follow the recommended proportions. Mix one gallon (3.8 litres) of acid with one gallon (3.8 litres) of water in a watering can. It is important to always add the acid to the water and not the other way around. Before applying the acid mixture, ensure the pool surface is damp.
Apply the acid mixture to a small section of the wall or floor at a time, approximately 10 square meters or 10 feet (300 cm) in size. Start at the top and work your way down, pouring the acid mixture onto the surface and scrubbing it with an acid brush. Leave the acid on the surface for 30 seconds to one minute. During this time, scrub the surface vigorously to remove any contaminants.
After treating a section, quickly and thoroughly rinse it with water to prevent the acid from damaging the surface. Repeat this process until the entire pool is clean. Pay special attention to the water line and the top 12 inches of the pool sides, as these areas tend to collect oily residue, which can cause paint issues. Once the whole pool is acid-washed, give it a final rinse.
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Neutralising the acid
The acid-washing process leaves a foamy puddle of residue on the bottom of the pool that must be removed. To do this, you will need to apply soda ash to the acid puddle. Use a pool brush to scrub the mixture, ensuring you use 2 lb (0.9 kg) of soda ash per 1 gallon (3.8 litres) of acid. If you accidentally used too much acid, you can rinse off the excess with water in which you have dissolved a little calcium carbonate, baking soda, or hydrated lime to neutralise it.
Pump the mixture into a bowl using a submersible pump. Dispose of the mixture, as the acid can be harmful to frogs, fish, and plants. Rinse out the bowl and pour water over any remaining residue, carefully rinsing around the drain.
Before disposing of your wastewater, make sure you have neutralised it properly. You can do this by adding the correct proportions of soda ash.
It is important to wear protective gear when handling acid, including clothing, goggles, a mask, gloves, and boots.
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Repairing the pool surface
Before painting your swimming pool, it is important to repair the pool surface. Firstly, if your pool does not have a hydrostatic valve and the water table is high, do not empty the pool. You must wait until the water table falls. If this does not apply, drain the pool completely, cleaning up any debris as you go. If your pool has an autofill, remember to turn it off during the drain.
Once your pool is completely empty, you can begin the acid-wash process. Acid washing is an effective way to remove persistent stains from your pool surface and walls. However, it is a hazardous activity that can cause serious damage to your pool if not done correctly. If you do not feel confident or comfortable working with acid, it is best to hire a professional.
If you choose to proceed with acid washing, ensure you have the correct protective gear, including clothing, goggles, a mask, gloves, and boots. Mix one gallon (3.8 litres) of acid with one gallon (3.8 litres) of water in a watering can, adding the acid to the water. Wet down one of the walls with a hosepipe, ensuring the water is running at all times. Pour the acid mixture onto the wall from top to bottom, scrubbing with a brush for about 30 seconds. Rinse the wall quickly and thoroughly, ensuring you neutralise the leftover water-acid mixture with soda ash to prevent damage to the plaster. Repeat this process for the next section, working on about 5-10 square metres at a time.
After acid washing, you should repair any tiles around the top of the pool and address any crack repairs. If you do not feel confident in your ability to perform these repairs, it is recommended to hire a tradesman. Repairs to walls and floors are generally easy to fix if they are not extensive. Once repairs are complete, scrape back any loose and flaking paint, sand all surfaces with abrasive paper, and wash down with fresh clean water. Allow the pool to fully dry, which can take up to 3-5 days depending on the weather and surface.
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Painting the pool
Painting a swimming pool requires careful preparation and planning. The quality of the paint finish will depend on the quality of the surface preparation. This process can take five times longer than the application of the paint, so it is important to plan well in advance. Before painting, it is essential to determine whether the pool surface is suitable for painting. Consider the number of times the pool has been painted before and whether the surface needs to be stripped back. Additionally, check if any tiles around the top of the pool require repair.
The first step in preparing the pool for painting is to ensure it is thoroughly cleaned. Begin by using a jet wash for the initial cleaning to remove any surface scum, algae, and dirt residue. If the pool has a high water table, it should not be emptied. Instead, wait until the water table falls. For a more powerful clean, consider hiring an industrial jet washer to remove stubborn surface contamination. After the initial cleaning, use a mild inline detergent to ensure a thorough clean.
The second stage of cleaning involves using an acid wash. Apply the acid wash solution to a lightly dampened surface using a garden spray. Work on small sections at a time, approximately 5 to 10 square meters. Use a stiff broom to work the solution into the surface, paying special attention to the water line and the top 12 inches of the pool sides, as oily residue tends to collect in these areas, leading to blistering and paint issues. Leave the acid to work for about 10 to 15 minutes, and consider applying a second coat if necessary. Once complete, rinse the entire pool with fresh water.
After the acid wash, it is important to repair any cracks or tiles that require attention. If you are confident, you can undertake these repairs yourself; otherwise, consider hiring a professional tradesman. Ensure that the pool surface is completely dry before proceeding with painting. This can take up to 3 to 5 days, depending on the weather and surface conditions. Tape off any areas you want to protect from paint, such as tile bands and fittings, using masking tape. Sweep the pool and its surroundings to remove any leaves or dirt. Check the weather forecast and ensure stable, dry conditions of at least 10°C for the painting process.
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