Even though it's late in the process, I think it would be okay to go ahead and add the Polyquat and sequestering agent. The worst case scenario is that you may have to use the ascorbic acid again, but at least now you know what order to use them in. Just watch your chlorine, because as Marie said, the acid will use a lot of it up, as will the Polyquat. Be prepared to add low amounts of chlorine to make sure there is "some", but not "a lot" of chlorine in your pool.

I know balancing metals and chlorine is tricky, but mbar is the resident expert (besides Pooldoc) on metals around the forum, so if you'll stick with her advice, she'll get you on the right track

Janet