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Thread: Liner staining

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    Herwick's Avatar
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    Apr 2016
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    Ardmore, Ok
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    49

    Liner staining

    Now that our water is clear we can see staining. There are 2 different ones that no amount of brushing seems to be getting rid of. The first and most troublesome, as it looks horrid, is a black ring around the pool. The second is a yellow stain on the floor of the shallow end.

    FC: 8
    CC: 0
    PH: 7.1
    TA: 97
    CYA: 25

    We got a lot of rain last night and had to do a partial drain this morning. Brought FC levels back up to 12 and gave my sock a few squeezes. We have been able to see the black stain for a little over a week, I think. The yellow stain we just noticed yesterday. Any ideas what they could be and how to fix them?
    1st time pool owner with 3 months of experience.
    25,000 gal, IG, vinyl, sand filter.
    ColorQ PRO 7 test kit

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    Herwick's Avatar
    Join Date
    Apr 2016
    Location
    Ardmore, Ok
    Posts
    49

    Re: Liner staining


    Here is the yellow staining. Its a lot more noticeable in person.


    And obviously the black staining.
    1st time pool owner with 3 months of experience.
    25,000 gal, IG, vinyl, sand filter.
    ColorQ PRO 7 test kit

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    Mod Squad pooldv's Avatar
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    DFW, TX
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    23,994

    Re: Liner staining

    Here are a couple of tests you can do to see if the stains are organic or metal.

    Rub a trichlor pucks on the stain for a 1-5 minutes to see if it lightens the stain. If yes then the stain is organic. Raise FC to half or a little more of a shock value and brush daily. FC/CYA Chart.

    Rub a Vit C tablet on the stain for a few minutes up to several hours to see if it lightens the stain. If it does then the stain is metals. Pool School - Metals in the Water and Metal Stains
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