Is this a copper stain?

scchan1w

Active member
Mar 6, 2019
34
Fremont, CA
Just had my pool replastered and it's been filled 4 days ago. I didn't add any sequestering agent as I though my fill water was low in minerals (and hence metal). But I'm noticing some light green stains showing up. I don't think it's algae as the water temperature is probably mid 50s - I didn't add chlorine until day 3, but FC was around 0.5 to 1.0 in my fill water. I raised FC to 3 to 4 yesterday and I think the stains are lighter now, but they don't brush off. I have GLB Sequa-Sol, wondering if I should add it now. Should have maybe added it during the fill but wasn't sure if it would do more harm than good. Thanks for any suggestions.
 

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mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
36,396
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Try Vitamin C. A couple tabs in a sock and set on it.

Could there me a metal fleck that got there? I assume you did not abalone.
 

scchan1w

Active member
Mar 6, 2019
34
Fremont, CA
There are more than one such spots, some bigger but lighter. So it’s probably not a piece of metal that fell in.

thanks for the vitamin c suggestion. I will try it but wondering if I should add the sequestrant
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
36,396
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
You might still try the Vitamin C trick. Just to see if it is iron or not.

Copper stains do not present themselves like that. And it would have taken a lot of copper (such as running very acidic water through a heater for a long time) to get enough copper in your pool right after a replaster.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
23,984
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
Sequestrant keeps metals in solution. They will not help you once the metal has been deposited as stain on the surface.

I doubt that metals in water will get deposited on the pool surface in 4 days.
 

scchan1w

Active member
Mar 6, 2019
34
Fremont, CA
Thank you @mknauss and @ajw22. I will monitor it and try Vitamin C when I get a chance. Good to know it's most likely not metals. I didn't see any new spots and the existing ones are the same or slightly lighter (e.g not getting worse)
 
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