What Ben said.
It's not that I doubt the CuLater works, My belief right now is that it does. We, here at Pool Forum, haven't seen enough positive results to recommend the product without reservation. I think you should try it - but - I don't have confidence enough to tell you that it will work. Like I said "Some people have had luck removing metals with a CuLater packet". perhaps you will have (and report) a positive experience that will bolster our opinion.