First thing you need to do is get a metal treatment product and use it accoring to the directions. If you need to make any ajustments to the water before you use it and are not sure what to do post and we will help you. You need to deal with the metal first before you start adding chlorine. Most of the metal sequstering products work pretty much the same. Like I said before, Jack's Magic Blue Stuff and ProTeam's Metal Magic are both good products that I am familier with. Just be sure you use the dosage for metals in water and not the maintenance dosage.