How to Lower the pH in a Swimming Pool
The optimal range for the chemical pH of swimming pool water is between 7.4 and 7.6. A pH lower than 7.0 causes eye irritation, rapid loss of chlorine, etching of plaster surfaces and corrosion of metal fittings. A pH above 8.0 makes chlorine inefficient, produces cloudy water, discolors pool surfaces and overworks the filter. A high pH also sometimes causes eye irritation. It is critical to maintain the correct pool chemistry for the safety of swimmers and the protection of pool equipment. Test your pool's water frequently to adjust its constantly changing chemical levels. Does this Spark an idea?
Things You'll Need
- Sodium bisulfate
- Muriatic acid
- Rubber gloves
- Safety goggles
- pH test kit
Instructions
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1
Test the swimming pool water to determine its pH level.
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2
Choose either sodium bisulfate or muriatic acid to increase the acidity of pool water if the pH level is too high. Sodium bisulfate is a granular acid that is relatively easy to use. Muriatic acid is a liquid commercial grade of hydrochloric acid that is inexpensive but corrosive, requiring safety precautions.
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3
Add sodium bisulfate to the pool water, either through a chemical feeder or by dissolving it in water first and pouring it directly into the pool. The amount you need to add depends on the size of the pool and the current pH of the water. Refer to the chart on the package to determine the correct amount.
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4
Wear rubber gloves and protective eyewear if you choose to use muriatic acid instead of sodium bisulfate. Refer to the label to learn the correct amount of acid to use. Pour the acid carefully into the deep end of the pool.
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5
Wait 24 hours and retest the water to make sure the chemistry is balanced.
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Tips & Warnings
Use caution when storing muriatic acid. Make sure its lid fits tightly to prevent harmful fumes from escaping and damaging electrical and heating equipment.
References
- Photo Credit Jupiterimages/Comstock/Getty Images
