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Thread: Hard crusty algae on vinyl liner

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    Hard crusty algae on vinyl liner

    I have been dealing with hard crusty algae on the sides and bottom of our pool for some time now. I have been keeping the FC at 14-16 and PH at 7.2-7.4 for some time now, but it doesn't seem to be doing anything. All the other algae in the pool is gone now except for this crusty stuff. It is a light greenish yellow color, and the only way I have been able to remove it is to scrape it off with my finger nail. We even bought Scotch Brite pads, but they really don't remove it very easily either. Plus, I'm scared of them scratching the liner. Anyway, has anyone else dealt with algae like this? If so, what can I do to get rid of it?
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    16x32 Grecian, vinyl liner, IG, 19000 gal.
    1.5 h.p. Hayward Super Pump 2 speed. Hayward S244T sand filter
    Circupool RJ45 SWG, TF100

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    Mod Squad zea3's Avatar
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    Re: Hard crusty algae on vinyl liner

    Can you post a full set of test numbers? I've not known algae to be hard and crusty. No idea what if could be yet.
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    Re: Hard crusty algae on vinyl liner

    My numbers are:
    FC-12
    CC-0
    TA-100
    PH-7.4
    CYA-40
    CH-275
    16x32 Grecian, vinyl liner, IG, 19000 gal.
    1.5 h.p. Hayward Super Pump 2 speed. Hayward S244T sand filter
    Circupool RJ45 SWG, TF100

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    Mod Squad zea3's Avatar
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    Re: Hard crusty algae on vinyl liner

    Did you ever have a high calcium problem?
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    Re: Hard crusty algae on vinyl liner

    Not that I know of, but the pool was already set up when we bought the house. According to what I've read, calcium generally isn't a big concern in vinyl-sided pools. I've read that as long as it is kept under 300, it's ok. That could definitely be wrong, though.
    16x32 Grecian, vinyl liner, IG, 19000 gal.
    1.5 h.p. Hayward Super Pump 2 speed. Hayward S244T sand filter
    Circupool RJ45 SWG, TF100

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    Melt In The Sun's Avatar
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    Re: Hard crusty algae on vinyl liner

    As zea3's been hinting, it sounds like calcium scale. Saying that calcium isn't a concern in vinyl pools is only half true; LOW calcium is not a problem, but HIGH calcium always is, no matter what the surface.

    If your pH got really high, with your numbers you could easily deposit scale. I could be just imagining it, but in your picture I can almost see little brownish-whitish specks on the side, which is how calcium scale often looks.
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    Re: Hard crusty algae on vinyl liner

    Yes! That is exactly what it looks like. Anyone got any good remedies for calcium scale?
    16x32 Grecian, vinyl liner, IG, 19000 gal.
    1.5 h.p. Hayward Super Pump 2 speed. Hayward S244T sand filter
    Circupool RJ45 SWG, TF100

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    frustratedpoolmom's Avatar
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    Re: Hard crusty algae on vinyl liner

    Usually on vinyl if the scale is fresh, maintaining a low ph for a couple weeks and brushing with a nylon (vinyl pool) brush can help it release...

    Pool stores sell "scale treatment" but I don't know anything about their effectiveness.

    Try keeping your PH at 7.0-7.2 for a several days and see if it has any effect when you brush.
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