Vinyl liner, algaecide and shock did nothing, continues to spread. Tried scrubbing it thoroughly, nothing changed. It started early July. Any help or suggestions would be appreciated.
https://photos.app.goo.gl/2iVRq56ecUe81Bmr6
Please help identify what type of stain this is
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- Swimming Pool Pro
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- Joined: Sun 11 Aug, 2019 03:48
- My Pool: 28' x 10' indoor, liner, oil heater, sand filter.
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Re: Please help identify what type of stain this is
Put a piece of chlorine tab on the stain to see if it's organic like algae, and a vitamin C tab to see if it's metal.
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- I'm new here
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- Joined: Sat 25 Sep, 2021 13:01
- My Pool: 20,000 gallons
Chlorine pool
Lagoon type
Re: Please help identify what type of stain this is
In my pool, which is a diamond Brite plaster pool with chlorine, not salt, that stain would be cupric oxide. It’s caused by too much copper reacting with sodium hypochlorite (sanitizer or bleach). The copper is to kill the algae. I was able to get rid of it once with aluminum sulfate. The aluminum sulfate knocked my chemistry off for weeks, so be aware. Be able to use those metal chelating packs instead, and overtime pull out some of the metal. CuLator. I would consider all of the chemicals you have been using in your pool and go from there.
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