I was reading this: ascorbic-treatment-to-rid-pool-of-metal-stains-t2298.html series of posts on treating pools with ascorbic acid to remove metal stains. The recommendation was to add the AA before the sequestering agent. Richard brought up the question of why the sequestrant was not added first. That seems logical to me because the sequestrant would be there to lock up the metal ions as soon as they were put into solution. But maybe there is something about adding the sequestrant first that interferes with the AA.
I don't believe the question was ever answered. Anyone have any ideas or experience with order of addition?