You need to test / have him test the water, and report results here, before you start dumping chemicals in.

There are two versions of "Metal Out" -- "Extra Strength Metal Out" and "Metal Out". I don't know what's in either, but they appear to be two different chemicals. If you call Doheny's, they might tell you what's in them . . . OR you can request an MSDS. Do NOT add another brand or even another type of Doheny's (Dohenys.com) metal ptoduct now.

Good, bad, or indifferent, "Metal Out" is what's there now. You might check the bottles to see exactly what they say. The fact that your builder is going to the pool store is not a great news -- it probably means he has little or no idea what to do.

You need to order at Taylor K2006 regardless -- Amazon link in my signature.