Finished AA treatment & added sequestrant; what happens over winter?

[2WeeksNotice]

I did the AA treatment this weekend for iron stains. Followed the TFP "Further reading" article on AA and the fiberglass at the waterline looks great. Jacks' Magic Purple stuff is my sequestrant.

2 follow up questions:
1. Going to close for the winter in ~2 weeks. AA treatment says to not SLAM for 2 weeks. I would like to raise the FC before closing, but don't want to re-stain the fiberglass with high FC. With this in mind, what's the recommendation for pre-closure FC level if CYA is 70?
2. What happens over winter with the iron & sequestrant? If the sequestrant breaks down over the winter, will the stains be back in the spring? Does it break down slower at colder temps? I have an autocover, so at some point I could add more sequestrant if not frozen, but would be tough to get it mixed thoroughly without a running pump. Or would the stains only come back in the spring with first SLAM? If so, then what the process for opening...sequestrant first, then SLAM?
Thank you...

 

[Texas Splash]

Cold water is your friend at this point. The colder the better so that you can keep the FC level somewhat low or in the place it is now. If you increase the FC you will increase the likelihood of staining and also accelerate the removal of the sequestrant. Just before closing, add a healthy dose of Polyquat 60 and open as soon as you can. That's about all you can do.

 

[Bperry]

I did the AA treatment this weekend for iron stains. Followed the TFP "Further reading" article on AA and the fiberglass at the waterline looks great. Jacks' Magic Purple stuff is my sequestrant.

2 follow up questions:
1. Going to close for the winter in ~2 weeks. AA treatment says to not SLAM for 2 weeks. I would like to raise the FC before closing, but don't want to re-stain the fiberglass with high FC. With this in mind, what's the recommendation for pre-closure FC level if CYA is 70?
2. What happens over winter with the iron & sequestrant? If the sequestrant breaks down over the winter, will the stains be back in the spring? Does it break down slower at colder temps? I have an autocover, so at some point I could add more sequestrant if not frozen, but would be tough to get it mixed thoroughly without a running pump. Or would the stains only come back in the spring with first SLAM? If so, then what the process for opening...sequestrant first, then SLAM?
Thank you...

Ideally you’de replace the water with new water that doesn’t have iron/copper in it. Perhaps during the winter you’ll get enough rain to fill it back up a bit and require some to be drained out. If you watch for big storms you can drain a bit out allowing it to be replaced.

 

[2WeeksNotice]

thanks both, appreciate it.