Ascorbic Treatment to rid Pool of metal stains

[librajenn626]

Hi. I have some stains on my vinyl pool liner that have already responded to ascorbic acid treatment 2 years ago but the spots only got lighter, they didn't completely go away and I just stopped trying. I want to try and get rid of them completely and so I was reading the article about ascorbic treatment to rid pool of metal stains (Ascorbic Treatment to rid Pool of metal stains). I see that it says that the chlorine level should be 0 so I'm assuming that when I open my pool that should be the perfect time to do this before adding any chemicals. Am I correct? Also, once the stain is gone it says to add a sequestering agent...what is that? I have never heard of that. Can someone recommend a good brand and suggest where I even buy this? Thanks in advance!

 

[AndyTN]

How much would it cost you to replace 50% of your water? This assumes you are not on a well. Read the other active post I am commenting on for someone else with iron stains. What has worked best for me is to do AA treatment and then immediately exchange at least 50% of my water to pump out the "iron water". Sequestrant only suspends the iron in the water but doesn't remove it.

Yellow stains on liner

As I understood the process, since I am not replacing the water, the iron never actually leaves the water, so my job is to keep it suspended in the water which would require monthly maintenance doses of the Metal Free, but it has not even been 3 weeks, and it is back. What did I do wrong "28"...

www.troublefreepool.com