Marie, Thanks so much....the Vitamin C (with rosehips) DID in fact clean the side walls of the pool...to make sure, I flipped the sock over and (with all my might) tried to unleash the stains by sscrubbing the walls....it did not make a dent in the staining...

That said, do you suggest any particular brand of metal out ?? or do I need the ascorbic acid at this point ??

I cannot tell you how much I appreciate your post.....although the water is holding a very high FC number, nothing else has been helping...(including 30 gallons of bleach in the past 7 days).....

Hoping you get this post before vacation....and HAVE a great vacation !!!(Away from PA :>......

Steve