0 CC is always OK.

Areating to lower carbonate alkalinity is also OK.

If you are having rusty backwash, that's ALSO good -- that's iron leaving your pool!

Where do you want to go from here? Are the remaining stains ON the pool bad enough to be of concern? Or, do you just want to clear up the pool, and get on with using it?

By the way, if you'd go here:
http://www.poolforum.com/pf2/profile...=editsignature
and add information about your pool -- gallons, pool surface type, pump & filter, chlorine feeder or SWCG -- that will help those posting answers 'get it right'.