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Certified Swimming Pool Stain Removers
pH The pH levels in your water play a central role in the way your pool water interacts with both the surface and swimmers.  We have noticed that the majority of stains in swimming pools are caused by fluctuations in pH that have not been corrected. Keep in mind that the pH scale is logarithmic.  This means that although the pH number range appears to be close, the differences in acidity are dramatic.  The attached table shows the pH of some common household items and chemicals that illustrate this dramatic variation in acidity. Incorrect pH levels in your pool are the most likely reason that swimmers complain about stinging or red eyes after swimming.