Good economical sequestering agent?

dford8583

Well-known member
Nov 30, 2019
54
Mobile, Alabama
I have identified stains on my pool liner are iron by doing the vitamin c in a sock test. It was amazing how the stain lifted immediately when I moved the sock across the stain! I immediately ordered a bucket of ascorbic acid and have it coming to the house. I am following the ascorbic treatment instructions. It mentions a sequestering agent being used before bringing the chlorine up. Upon looking online at some of the recommended sequestering agents, they look expensive. Is there a recommended sequestering agent that is more cost efficient?
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
37,053
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Have you read the following article? It provides suggestions on how to filter out the iron once you release it from the pool surfaces. Also some sequestering agent recommendations.

 

dford8583

Well-known member
Nov 30, 2019
54
Mobile, Alabama
I did read through the top but didn’t see the one about filtering. Thank you for sharing. So the iron can be filtered out then? Even if in solution?
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
37,053
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
The iron can be filtered out if not sequestered.
It is a dance as once your are done with the AA treatment, if the iron level is high enough, you can get staining once you reintroduce chlorine. But you need chlorine or you will get algae.
As you get rain, devising a catchment apparatus that could displace some of your high iron pool water with iron free rain water would make sense, if possible.

There are a number of innovative methods in threads within the forum. Some are linked at the bottom of the Wiki article I linked to.
 

dford8583

Well-known member
Nov 30, 2019
54
Mobile, Alabama
I see. Yeah I did check out some of that. I have a long gutter close to my pool. I will look into rigging that to catch some water for the pool.
I am wondering if my fill water is responsible. Are there recommended test kits to check ppm of iron in my pool and also my fill water?
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
37,053
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Fill water would be your only source.
We typically recommend using a pool store to test for metals. The test kit is expensive. And accuracy is not really needed.
 
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dford8583

Well-known member
Nov 30, 2019
54
Mobile, Alabama
Sounds good. I will look into that. I am confident I have iron. I guess ideally, I would like to remove the iron so I guess I will get to work on that.