Black Stains Not Sure if from CYA or more

Calguy

Member
Jul 31, 2022
7
northern california
Hello, I have a pebblec pool and an issue started after my EX pool guy(I do all stuff with TFP now) dumped 2 pounds of CYA and let it sit in the deep end.

After wards a dark stain/damage appeared where the CYA sat. The strange thing is that the dark spots are showing up more as time goes on.
I did at CYA myself in the area but used a legging and dangled it in the water while agitating it with a 2 by 4. The CYA that left the legging over about 6 hours time as very vine/diffuse and the pump was running the whole time. I have SLAMMED the pool recently and passed the overnight test.

Any help on repair/stain mitigation is greatly appreciated.

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Those dark stains look like metal stains - iron or copper.

Put some crushed vitamin C in a paste in a sock and rub it on the stains. If it lifts then it is iron staining.

 
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