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A low pH in a swimming pool can be caused by rainwater or other foreign matter entering the water in the pool. Corrosive metal jewelry, stinging eyes and nose, and itchy skin are all signs that the water in the pool has a low pH. Regular testing and chemical treatment of water will help maintain the pH in the tank. One of the most common ways to raise the pH is with baking soda (also known as soda ash or sodium carbonate).
Steps
Check the pH in the tank
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Use a pH test strip. You can buy these test strips at pool stores, department stores, or online. Follow the instructions for use, usually you will dip one end of the test strip in water, then compare it with the color chart read the results on the product. [1] X Research Source
- With some other test kits, you’ll need to fill a tube with pool water, then add a few drops of a chemical that changes color based on the pH in the water.
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Check chemical levels one to two times a week. You should record the pH in a small notebook to track changes over time. The pH in your tank will change for a variety of reasons, so regular testing is important.
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Maintain pH between 7.4 and 7.8. The pH test strips will change color when immersed in water. These colors reflect the respective pH. Compare the test strip with the color chart on the product to know the pH in the water at the moment. The ideal pH for swimming pools is between 7.4 and 7.8. You then need to determine how much more to raise the pH.
- For example, if the test strip shows a yellow color like a banana peel, when compared to the color chart, the corresponding pH will be 7.2. This means you need to increase the pH to at least 0.2 and at most 0.6.
Calculate the amount of soda powder needed
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Calculate the amount of water in the tank. If you already know the volume of the tank, use that number to calculate. If you do not know, you can use a tape measure to measure and calculate the volume based on the shape of the tank. [2] X Research Source
- For a rectangular pool, the formula for volume will be length x width x average depth x 7.5. If the tank has one deep and one shallow end, measure the depth at each end and then add it and divide it by 2 to calculate the average depth.
- For a circular pool, the formula will be diameter x diameter x average depth x 5.9. If the pool has a deeper section, add the depth at both shallow and deep, then divide by 2 to get the average depth.
- For pools of other shapes, you can adjust the above formulas to calculate the volume of each part of the tank, or have an expert estimate the volume of water in the tank.
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Calculate the amount of soda powder needed. You need to use about 170 g of baking soda to raise the pH 0.2 for 37,850 L of water. Use this number as a mold and add more baking soda if you need to raise the pH more. [3] X Research Sources
- For example, when testing the pH level in water, the result is 7.2. If you want to increase this concentration to 7.6 and the volume of water in the tank is exactly 37,850 L, you need to use 340g of soda powder for the first treatment.
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Buy soda powder at a pool supply store or order it online. There are many different brands of soda powder on the market, you need to carefully look at the ingredients section and choose products that are mainly sodium carbonate. If you’re not sure, ask the salesperson which products contain soda ash.
- If you’re not near a pool supply store, you can try shopping at a water treatment store, supermarket, or department store like Walmart.
Put soda powder in the pool
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Run the water purifier when adding soda powder to the tank. Baking soda works best when well circulated in the tank. To ensure this, you should run the purifier in normal mode. If you have turned off the filter to clean the tank, remember to turn it back on.
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Fill a bucket of about 19 L with water. You should not pour soda powder directly into the pool to avoid the powder dissolving unevenly. Instead, dissolve baking soda in a bucket of water, then pour it into the tank. If you don’t have a 19 L bucket, you can use any other bucket. Mix baking soda into at least 3.8 L of water.
- You should put the water in the bucket first and then the soda powder.
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Take the required amount of soda powder to dissolve in a bucket of water. Use the amount described above to get the amount of soda you need. You can use a measuring cup or use a scale to weigh and then pour the soda powder into the water. [4] X Research Sources
- Remember not to pour the baking soda into the bucket before adding the water.
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Pour water mixed with soda powder around the pool. With a deep underground pool, you can walk around and slowly pour the water in the bucket into the pool. With a pool built higher than the ground, try to pour water mixed with soda powder around the sides of the pool.
- If you want, you can use an old plastic ladle to scoop the water out of the bucket and pour each ladle into the pool.
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Wait a while for the soda powder to circulate in the tank and alter the pH of the water. After an hour, you take another test strip, dip it in water and check if the pH has reached the desired level.
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Add baking soda if needed. In general, you should not use more than 455 g of soda powder per 37,850 L of water. If more than this amount is added, the water will gradually become cloudy. [5] X Research Sources
- If the pH has not reached the desired level, check again after a day or two and add soda powder in the amount calculated according to the above calculation.
Advice
- Test strips also help determine chlorine concentration, alkalinity and calcium hardness of water. Maintaining all the above chemicals at the right concentration will help keep the pool water clean, hygienic and safe.
X
This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
This article has been viewed 4,304 times.
A low pH in a swimming pool can be caused by rainwater or other foreign matter entering the water in the pool. Corrosive metal jewelry, stinging eyes and nose, and itchy skin are all signs that the water in the pool has a low pH. Regular testing and chemical treatment of water will help maintain the pH in the tank. One of the most common ways to raise the pH is with baking soda (also known as soda ash or sodium carbonate).
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