I need help. In my work place (we mainly treat copper contaminated water), our downstream are pointing the chlorine content of our water for the cause of their copper concentration going up after the waste has gone through their chelate towers. This chlorine content shows no visible indication in the water so it's tough to point out. The hypochlorites comes from the downstreams scubber towers which mainly cleans the air of HCl fumes. They put liquid chlorine to remove the smell and the water goes to us mixing it with acidic waste water containing [Cu] less then 1000ppm. The question is, can hypochlorites disable the chelate resins to release the copper instead of absorbing the copper? Also, at what concentration of hypochlorites does it happen? We have hypochlorite concentration ranging from 600 to 5 ppm. We used Metabi sulfite to treat the hypochlorite and hydrogen peroxide content in the waste that causes floating slurry. However, we only specify the flowrate and concentration of metabi sulfate solution for hydrogen peroxide and not for hypochlorite. To test the hypochlorite concentration, we use a pack test which my supervisor said is not reliable since it can also detect Cl- and Cl2. Also, using the low grade and high grade of ClO- pack test shows different results. This maybe due to ClO- being really sensitive. Additional to that question, can Cl- and Cl2 also disable the absorbing abilities of the chelate resins? Is there a more reliable testing to be done to check the hypochlorite content?