Your ph level is jumping from high to low - first of all get it adjusted between 7.2-7.6, preferably on a pool with iron problems on the lower end between 7.2-7.4.

I have to deal with iron every year in my pool when I fill, so I've got it down pretty good. You should have enough of the Bioguard pool magnet in your pool. That's the same kind I use and it works well. Do not add any more chlorine until you know you have the iron out of your pool. I actually let my pool filter for at least 2 days after using the pool magnet to let my filter do it's job. Then take a sample of your pool water to a pool store and have them test the iron level. When you know the iron is gone - then add chlorine slowly and get it back up to shock level until it clears up. I do treat with the poly 60 right away too, and use a maintenance dose every week just as a precaution. There's just a small percent of us who have to deal with iron in our water on this forum, and it does make you follow a little different game plan. Also - like said before, use some POP - Pool owner's patience. Been there, done that - just relax it'll all clear up.