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[Texas Splash]

Welcome to TFP! Are you on a well? Try the following DIY tests:
1 - Vitamin C tablets - iron
2 - Rub a chlorine tablet on the stain, but don't leave it on one spot - organic
3 - Put some dry acid (i.e. pH Down) in a sock and rub the area - copper.

Also post a full set of water test results and tell us what chemicals may have been added to the water since it was filled if you know them.

 

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[Texas Splash]

Numbers look solid. I would try each of those tests above to see if it gives us any clues.

 

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[Texas Splash]

I see what looks like staples in the plaster. Those of course would be iron themselves. But if the Vitamin C made the stains darker, I suspect copper. The pH Down "should" be a good indicator.

 

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[Texas Splash]

Vitamin C won't work on copper or organic. You may have a combination of both down there the way you pool was first opened. Doesn't sound like the most stellar operations unfortunately.

 

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[ajw22]

Try…

Stain ID Kit | Jacks Magic

jacksmagic.com

 

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[ajw22]

Call Jacks and discuss it with them.

 

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