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The acidity/alkalinity of pool water, as measured by its pH, is one of the most important characteristics to regulate. If the pH is low – meaning the water is acidic – swimmers can suffer itching skin, rashes, burning eyes and dry hair. The pool and all its components can suffer, too, because acidic water corrodes tiles, metal accessories, and machinery in the water circulation and purification system. Additionally, free chlorine levels become difficult to maintain in acidic water. Despite all this, it's usually still safe to swim in the pool. It just might not be comfortable.
