Thanks a lot everybody for you're help!
Another question, when I made my first treatment with acid citric, I let my sand filter to filtrate mode and know I realized it was not a good idea. So for my next AA treatment, I was wondering if I can run my sand filter a little time (like 1 hour) for making sure that I can removed all the iron particles from it (probably some are trap in the sand filter)? Right after that, I will add the sequester and doing a backwash just to make sure that I can remove the most metallic particles. After that step, I will do the exchange/replace water method with the sand filter on Recirculate mode.
Is it a good idea? What do you think?
And for the sequester, I buy the jack's magic purple stuff for my salt pool and I will be using it only after my AA treatment and water exchange. But right after the AA treatment, which sequester should I can used? Because from now on, I have not much salt in the pool because I already drained it a lot. Should I use the jack's magic pink stuff when I did my exchange/replace water treatment and how much should I used (1 bottle)? Because right after that I will rebalance the water chemistry , add the salt that been drained and maintain the jack's magic purple stuff sequester.
Thank you again for taking the time to answers my questions!