Just wanted to provide a little update, the refill finished up yesterday. Thanks everyone so much for your help, I used pool math after refill added some stabilizer, chlorine and acid, CYA is sitting right at 40, FC and PH are perfect, water looks great just waiting on my robot to get here to assist with vacuuming but the water looks fantastic and it's supposed to be over 100 today, should be swimming this afternoon. As for the staining at this point I don't think there's anything I can do, and I don't think it's iron, it could be but I think maybe at some point someone used heavy amounts of copper algaceide and it's copper staining. Either way thanks everyone for your help