We use pH as an index to express how acidic or basic a solution is. (The scientific definition of pH is “the negative logarithm of the hydrogen ion concentration”.) A pH greater than 7.0 is basic, and a pH lower than 7.0 is acidic. In pools and spas, it is important to maintain the water in the slightly basic range of 7.2 to 7.8. The National Spa and Pool Institute (NSPI), the industry association in the United States, has set a standard of 7.2 to 7.6 as the ideal pH.
If pH Is Low:
- The water can corrode surfaces, metal equipment or fixtures.
- Swimmers and bathers can experience discomfort from burning eyes and itchy skin.
- The chlorine may dissipate more quickly.
- The water may cause pitting and etching of plaster surfaces.
If pH Is High:
- Calcium and metals tend to come out of solution (the opposite of dissolving) at high pH levels, creating the potential for staining and scale formation. The calcium and metals will actually create deposits and discoloration on pool walls and equipment.
- Swimmers and bathers can experience discomfort from burning eyes and itchy skin.
- High pH can contribute to cloudy water.
For more detailed advice on the specific chemical treatment for your pool or spa, contact your dealer.
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