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Thread: Vinyl Liner Stains

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    Vinyl Liner Stains

    New pool owner - started noticing blackish and brownish stains on IG pool liner - numerous, some small, some larger. Seem to get a bit lighter when I shocked. My chemistry is good. Tried scrubbing and running a chlorine puck over it - nothing. Is it algae? Is it organic? Please help. detracts from looks of pool.
    36K IG Vinyl, Hayward Super 1.5hp, Hayward DE4800, Dolphin Robotic

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    Re: Vinyl Liner Stains

    Welcome to the forum!

    If you've been reading any of the other posts, you know the first thing we ask for is test results. Can you give us some current ones?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Vinyl Liner Stains

    Thanks for your reply. I just tested the water. FC 5, pH 7.6, TA 130. My test kit does acid demand which was 2 and it said I should add muriatic acid. Any thoughts?
    36K IG Vinyl, Hayward Super 1.5hp, Hayward DE4800, Dolphin Robotic

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    Re: Vinyl Liner Stains

    Hold the chlorine puck directly on the stain for a couple of minutes. See if it lightens up some

    If not, crush up some cheap Vitamin C tablets, put them in a sock, then hold that sock directly down on the stains for maybe 3-4 minutes. Tell us the results
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Vinyl Liner Stains

    Thanks again for quick reply. Don't have Vit C tabs (take a multi ) but tried the chlorine puck for a couple of mins and it definitely lightened the stains. Had tried previously but was afraid to leave it on too long so no noticeable difference. This time after 3-4 mins noticeably lighter stains. What's up with that?
    36K IG Vinyl, Hayward Super 1.5hp, Hayward DE4800, Dolphin Robotic

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    Mod Squad woodyp's Avatar
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    Re: Vinyl Liner Stains

    It means your stains are organic in origin rather than from metals.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
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    Re: Vinyl Liner Stains

    That means the stains are organic and elevated levels of chlorine plus frequent brushing will remove them.

    My assumption is you cannot test for CYA.

    Before we suggest a level to bring your FC up to (and hold it there) we need to know your CYA level. Take a sample to a pool store to get it tested or, better yet, take charge of managing your own pool by purchasing a good kit that will test for everything you need.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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