Sometimes you will see an improvement with the metal out - especially on new stains. The ascorbic acid treatment is really magical though, the stains just disappear in front of your eyes. Just remember to add some polyquat algaecide too, this way while the chlorine is low from the ascorbic acid, you won't get any algae (which when shocking the pool can lead back to stains ) Start with raising the chlorine up slowly with bleach, and if you see stains start to form, add more sequestering agent. Keep the chlorine on the low side of the "best guess chart". Keep the ph low for the first couple of weeks - no higher than 7.2. Good luck, and hopefully I'll be able to get online during the vacation to answer any questions you have.