I tried the ascorbic treatment and everything looked great . I brought the alkalinity up with soda and the PH up with borax. Looked good for a week and now the stain is back almost as bad as when I started. The water read is
PH 6,9 ,Alk 110,Cal hd 200,copper 5, CYA 120, chl .5. There can't be much of my heat exchanger left ! It looks like the sequa-sol either wasn't enough or didn't work well.Is there a better sequestor to use??With that much copper in the water is there any way to get it out? Will adding sequestor be a rountine ?

Thanks Marie for your help the pool looked really great after the initial treatment. Sure would like to get it like that again and keep it that way.