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Thread: Just starting anybody might know what these stains are?

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    JanHan's Avatar
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    Just starting anybody might know what these stains are?

    I posted my first readings the other day and am in the process of trying to get my levels right. But I was wondering if anybody might have suggestions on what these black stains are? My water hardness is out of control and know some is scaling but is the black stain mold? It is only above the waterline where water flows into pool from rocks. No mold in pool. Not sure if I should wait to even address it until I get my CYA and chlorine under control. ThanksIMG_4497.JPGIMG_4489.JPGIMG_4490.JPG


    TF-100 kit, 22k gallon IG, Gunite, Jandy CV580D cartridge filter, Pentair Whisperflo pump, Pentair Automation system w/Easy Touch remote, Pentair LA01N Pump w/ Polaris, attached hot tub w/Pentair MasterTemp 400 heater, Silencer Air Blower 2.0 hp

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    Re: Just starting anybody might know what these stains are?

    Have you tried spraying it with diluted bleach and letting it sit abit?
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    Mod Squad pooldv's Avatar
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    Re: Just starting anybody might know what these stains are?

    I have never seen anything like that. No idea what it is. I agree, try bleach and a brush first. Then try some diluted muriatic acid, start with a 3 or 4 to 1 dilution. Go stronger from there if it doesn't work. Always add acid to water when diluting.
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    JanHan's Avatar
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    Re: Just starting anybody might know what these stains are?

    Thanks! I'll try some bleach first and go from there


    TF-100 kit, 22k gallon IG, Gunite, Jandy CV580D cartridge filter, Pentair Whisperflo pump, Pentair Automation system w/Easy Touch remote, Pentair LA01N Pump w/ Polaris, attached hot tub w/Pentair MasterTemp 400 heater, Silencer Air Blower 2.0 hp

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