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It's far more likely the peroxide is causing the discomfort. I'm afraid a peroxide level capable of keeping a pool clear and somewhat sanitary is also noticeably uncomfortable, it's one of a few reasons we don't promote its use. Most algaecides will not cause discomfort at any level and only some may be uncomfortable but only at extremely high levels that I couldn't imagine you added. Of course, due to the shortcomings with a UV/peroxide system, there is the possibility that something could be growing and causing this discomfort.