Thank you for information..
I few questions why or how to drain out what i have added... does that mean empty pool... I have a shallow well that is on a timer to fill pool.. I will if its a must. It does puts a hurting on well. (picks up lots of dirt)
Sand is new and full in filter last year.
"The process above will tend to result in the iron coming out on the filter" Do you mean back into pool or stuck in sand .

how many bottles of ployquat to get?
muriatic acid any type from home depot

10. Do NOT backwash more than you have to do. I am new to pools why would i back wash?
Thanks so much B2R