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Costco carries the Clorox XtraBlue shock but I noticed it has .25% copper metallic. I've always been concerned about chemicals with copper, but not sure if this amount is not enough to do anything or not. Is this something to be concerned about with an in ground pebble tech pool?

My salt level is below the recommended Pentair levels, but the green light is on and it is generating chlorine. Should I leave it be, or bring my salt level up to the recommended level of 3400. It is currently at 2400. I have checked it with a digital reader I have and also taken a sample of...