Go to your local pool store and have them test your water. Then buy what they suggest and put it in your pool.

And yes, 2.0 is way too high.

I have a POOL FROG Model 5400 in a 30,000 gallon pool and the copper levels are at 2.0. Is this too high? I did get a metal free chemical just in case, will that work? ALso, how do I tell the difference between a green copper stain and an algae stain? Thanks in advance!