John, you have it down pretty well. You will need about 1 to 2 lbs of ascorbic acid for 10,000 gal. It really depends on how much staining you have. Once you take the ph & chlorine down - you won't have to take it down anymore - the ascorbic acid will do that. When you add the ascorbic acid wlak around the pool dropping down the sides of the wall, put your filter on circulate if you have that mode - if not just keep it filtering. You can add the sepuesterer right away - you want the metals to bind with the sequesterer as soon as they are lifted off the surface of the pool. Keep the filter running 24/7, after all of the stains are gone, and 24 hours have passed, you can start to bring up your ph - sometimes it takes a while, although some people don't get the low ph from the ascorbic acid, I always did. Metal Magic says to use when the ph is above 7.5, so if you use Metal Magic, I would put that in before the ascorbic acid while your ph is high. It probably will bring down the ph, that's why they want you to use it with a higher ph. You can put this in right before the ascorbic acid, however long it will take it to circulate through the water.

After 48 hours you can start to raise your chlorine level slowly. It will take a while to hold, so you have to keep adding it to get it to hold at the low end of your chlorine demand for the amount of cya you have. I like to use regular bleach to raise the chlorine slowly, because you can control the amount you use. You can also put a trichlor puck in the skimmer while you are starting to raise the chlorine - this way any metal that is going to stain when it hits the chlorine will stain on the filter. Do not put the bleach in the skimmer while a trichlor puck is in it - you can pour it in the water by the return jet. If you see any staining start to come back, lower the ph back to 7.2 and add some more sequesterer. The important thing is to get all of the metals that come off the surface sequestered, so they don't fall back out when the chlorine is raised. If you have a lot of staining you will need a lot of sequestering agent - more than the bottle says. Don't get worried if the water gets cloudy - just keep the filter running. If you are afraid of algae, you can add a dose of polyquat before you do the stain treatment. I have never gotten algae while doing a stain treatment, but I usually had to do them in the beginning of the summer when the weather was not hot, and the water was cold. Hope you can understand all of this - if you have any questions please feel free to ask. Good luck. If you need a link to find ascorbic acid let me know.