MP, welcome to the forum, just a couple of thoughts:
At any time durring the process you described, was a chem put in that has blue dye in it? Was the copper from your well water sucessfully addressed? (I'm thinking that it might be the copper causing your 'blues') How do you chlorinate the pool - specific products and descriptions, please? Any chance of a picture of the pool/ color? Did your pool pro change the sand in your filter after sequestering the copper? Finally, could you please post a full set of water test #s? The answers to these ?s would go a long way for the great folks on the forum to be able to help you.
-Sorry I couldn't give you a quick fix, but I'm/ we're interested in helping you with your pool and need some more info in order to do this, as you seem to have been in regular contact with a pool dealer, I'm hoping that providing this won't be too much of a hastle. Good luck with the 'blues' and if I can be of further service, never hesitate to ask of me!