No! Don't add any more of the Metal product (20% HEDP)

How did you get such high calcium levels? Is that much calcium present in your fill water?

You have a sand filter, right? If so the best way to run your pool might be with calcium hypochlorite and high stabilizer. I've been working a chemical guide page, and was very surprised to discover this AM that cal hypo can be purchased fairly economically at Amazon . . . if you know what to order.

The benefit, for you, is that doing it this way -- with a sand filter -- would allow you to continuously remove iron from your water. You'll end up with a manually dosed pool running with high calcium, moderate alkalinity, fairly high pH and high stabilizer. It won't be hard or expensive at all -- just a little different. If you get a K2006 (yeah, I'm still on that track!) you'll probably be able to work up to dosing just 1x per week, plus whenever you have to add water.

You could also use dichlor, and wouldn't have to add stabilizer manually. It will be more work to control the metals, whenever you have to add water, if you go that way.

MEANWHILE, add bleach in the evening, 1/2 gallon at a time to maintain your pool while you decide. But, the first time you add, add 1 whole gallon of 6% plain bleach, close to sunset. Test the water first thing in the morning, and again in the evening with OTO, not DPD. Let me know what you find.