Which chemical is used to lower pool pH?

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Multiple Choice

Which chemical is used to lower pool pH?

Lowering pool pH is achieved by adding an acid to the water. Muriatic acid (hydrochloric acid) is a common choice because it donates hydrogen ions, which directly lowers the pH. It can also lower total alkalinity, so pH and alkalinity are often adjusted together. The other substances in the list do not lower pH: soda ash raises pH, sodium hydroxide raises pH, and calcium chloride mainly increases calcium hardness with little direct impact on pH. Handle muriatic acid with care, add it to water (never the other way around), work in a well-ventilated area, and wear appropriate protection.

Lowering pool pH is achieved by adding an acid to the water. Muriatic acid (hydrochloric acid) is a common choice because it donates hydrogen ions, which directly lowers the pH. It can also lower total alkalinity, so pH and alkalinity are often adjusted together. The other substances in the list do not lower pH: soda ash raises pH, sodium hydroxide raises pH, and calcium chloride mainly increases calcium hardness with little direct impact on pH. Handle muriatic acid with care, add it to water (never the other way around), work in a well-ventilated area, and wear appropriate protection.

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