I've looked through the various threads and see how to use vitamin C to remove small rust areas (I have one on my ladder and one on the fiberglass steps, likely from the water being out of balance due to the previous owner not having a clue how to manage a pool.). My question is this: given that my two spots are not very big, do I need to use a sequestrant? Or is that needed for larger removal only? I've included pictures of my two spots. Please excuse the pollen, I do brush it down every day, it's just a never ending process right now.
28k gal rectangular I ground vinyl pool, Pentair IntelliChlor C40 SWG, Pentair SandDollar filter, Pentair 1.5hp pump with a Pentair 3/4hp booster pump for the KreepyKrauly. Using Taylor K2005 test kit with additional Taylor FAS/DPD kit and following the TFP maintenance method.