Can you link me to their reaction?
I have two bottles of coppersafe and am waiting for a Hanna meter
That was their reaction to me. They essentially called us idiots.
Do you have an API test kit?
I found that dosing .88ml-1.07ml coppersafe per gallon of water yielded 1.81-2.07ppm. That said, I can't guarantee your bottle will have the same concentration as mine