I just had the water tested for copper. It came back with a positive reading of 1.7. According to the local pool store, that's why my water turns green when I add shock. Does that make sense? He sold me something called pool magnet plus. He said the algicide probably contained copper. I looked at the ingredients of the algicide and it was not listed but did have 51% OF "Inert ingredients". Any suggestions on the removal of copper? I am working on getting the PH up. I added 6lbs of baking soda. How long do I need to wait to retest PH?