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From https://www.swimmingpoolsteve.com/pag... - Why is my skin itchy every time I go swimming? The most common thing is that there is going to be something wrong with the chemistry values or the chemical balance of the swimming pool. It is worth mentioning that some people are more sensitive than others to imbalances of the water chemistry. These people might be the only ones to react when other swimmers in the exact same pool at the exact same time do not react to the water. Any time you have a reaction of dry or itchy skin, you should endeavor to do a complete chemical analysis because even though the water might look good, there could be something wrong with one or more of the chemical values that could be causing this. Some people complain of itchy skin, especially when the pH or sanitizer levels are too far from the correct operating ranges. In the case of sanitizer, there is an additional layer of complexity in that the free chlorine value is not the only sanitizer level you need to consider. You must also consider the combined chlorine value which unfortunately you cannot measure directly, you can only measure total chlorine and then the free chlorine and these two should be exactly the same in a perfectly balanced swimming pool. When these two are not the same this indicates combined chlorine in the water. When combined chlorine levels reach 1ppm or more, the water will be very likely to cause dry or itchy skin to sensitive swimmers.

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