Several of the Premium 5 products contain copper. Is it harmful?

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Several of the Premium 5 products contain copper. Is it harmful?

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The aim in using Premium 5 products is to achieve and maintain a working level of copper of around 1ppm. To put this in perspective, the recommended maximum for pool water is 3ppm. The World Health Authority allows up to 10ppm in food, and our recommended dietary intake of copper is 3g per day!