Rather than leave everyone hanging, Here is the end of this saga. The stain is gone and the pool is back to normal.

It took a total of 6 days to bring the chlorine and pH back into range and keep it there without a lot of extra messing around. I have started using the maintenance dose of Metal Free so hopefully this process will not have to be repeated anytime soon (Never will be too early). So far I do not see anything "falling out" so I suppose it has been captured (hopefully forever).

Other than the cool nights and lack of sunshine, swimming might get back into the near future but the weatherman is not cooperating (65 high tomorrow) -- Pool temp is 79 today (my minimum is about 83).

Thanks again for the help and Information. This thread gets printed and filed for future reference.