hi, I brought my water in today to a pool place and they told me, once again I have copper in my water which is a 2

chlorine 0
ph 7.6

alk 120
hardness 69

they told me that I have to get rid of the copper before I can shock my pool, is this true?? I didnt have copper when I checked my water at the last pool place. Is this a way to get us to buy more chemicals??
What do I need to do in order to get my water up? I have a 70, 000 litre pool......lots of borax at home, hoards of javex and I also have baking soda..........thanks in advance for the advice!!!!!!!!!!!!!!!!!!!!!!!!