First of all, let me thank MBAR for their write up of ascorbic acid treatment from years back. I am on a well here in South Florida and do have some iron in my water but never enuf to stain household fixtures or my vinyl pool liner. Sure enuf, after 25 years of maintaining this pool without stains, I got some iron staining after finding and following the TFP method. Not complaining mind you, just sayin.... I'm very happy with the TFP method and will continue to practice. I guess it happened due to my rookie mistake of trying to keep my FC levels at the proper SLAM levels ( FC of 24 with CYA of 60 ) for several days while trying to get rid of an algae bloom, but not paying attention to my pH levels. Previous to finding TFP, I had never raised my FC that high and subsequently never caused iron to stain. My bad, no one else's.
Anyhoo... Followed MBAR's ascorbic acid treatment and WOW I have my pretty blue liner back, all the stains are gone!!!
As I sit here writing this I am about 1 hour post putting Jacks Pink stuff in pool after AA. DE filter is running. Polyquat 60 added. Questions:
1. So the iron is now off my liner and now in solution? How do I get all that sequestered iron out of my pool? I am on a well and have no problem draining and adding water..........Thinkin bout lowering my CYA a bit anyway.
2. Since this is the first time in 25 years that I have had this iron staining am I correct in assuming it was caused by the high FC levels and high pH and my rookie mistake during SLAM?
3. And if #2 is correct, can I assume that I've always had iron in my pool water, but chemistry did not allow it to stain?
And lastly, am I now married to using sequestrant maintenance on a regular basis? or will ridding my pool of the now sequestered iron and monitoring my pH in relation to my FC do the deal?
And last, lastly, MBAR advised to raise FC "slowly" while maintaining pH at 7.2. How slow is "slowly"? Hours, days?....
And how often do I need to repeat the Polyquat 60 while raising my FC?
Sorry to be so long-winded, but I sincerely want to thank everyone on TFP for their selfless and informative help.
I'm so glad I found ya'll. Thanks again, MBAR.
Dave
Anyhoo... Followed MBAR's ascorbic acid treatment and WOW I have my pretty blue liner back, all the stains are gone!!!

As I sit here writing this I am about 1 hour post putting Jacks Pink stuff in pool after AA. DE filter is running. Polyquat 60 added. Questions:
1. So the iron is now off my liner and now in solution? How do I get all that sequestered iron out of my pool? I am on a well and have no problem draining and adding water..........Thinkin bout lowering my CYA a bit anyway.
2. Since this is the first time in 25 years that I have had this iron staining am I correct in assuming it was caused by the high FC levels and high pH and my rookie mistake during SLAM?
3. And if #2 is correct, can I assume that I've always had iron in my pool water, but chemistry did not allow it to stain?
And lastly, am I now married to using sequestrant maintenance on a regular basis? or will ridding my pool of the now sequestered iron and monitoring my pH in relation to my FC do the deal?
And last, lastly, MBAR advised to raise FC "slowly" while maintaining pH at 7.2. How slow is "slowly"? Hours, days?....
And how often do I need to repeat the Polyquat 60 while raising my FC?
Sorry to be so long-winded, but I sincerely want to thank everyone on TFP for their selfless and informative help.
I'm so glad I found ya'll. Thanks again, MBAR.
Dave