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Thread: Help Please, what are these stains ?

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    Help Please, what are these stains ?

    Hi Everyone

    New(ish) pool owner
    In South Africa, summer time over here now.
    Had Fibreglass pool installed "last summer."
    Salt Water Chlorinator and Heat Pump, black pool cover(the type that floats on the water with the bubblewrap look)

    Maintained well over the summer. Didnt use at all during winter. Ran pump and tried to maintain as often as possible during winter
    but noticed dark grey stains all down the sides of the pool (see linked pics)

    Some say black algae, I say but it's a fibreglass pool and its not slimy or doesn feel like algae and it doesnt come off with scrubbing, at least not very easily. vey very hard to scrub off
    Some say Cobalt Migration, whatever that is.
    Some say your gel coating wasnt sufficiently applied.

    These are "pool shops" Im walking into and describing the problem........admittedly having not shown the pics.
    Can anyone help please and advise how i can get rid of this and prevent it.

    Thanks so much in advance pleas try both links, they're the same pics. my first time posting so hope it works.

    https://www.dropbox.com/sh/rrjzfqnkijov5lc/ecxjul1Q6C

    https://www.dropbox.com/sh/rrjzfqnkijov5lc/ecxjul1Q6C

  2. Back To Top    #2
    pwrstrk's Avatar
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    Re: Help Please, what are these stains ?

    Welcome to TFP !
    I'm not sure what the stains are but somebody will be along to help you out. Enjoy the forum.
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Richard320's Avatar
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    Re: Help Please, what are these stains ?

    It looks sort of like calcium scale to me, but I don;t have a fiberglas pool, so I can't say if gelcoat problems look like that, too. How about some test readings?
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Help Please, what are these stains ?

    My readings are normal now but during winter they might have gotten out of hand for periods. I have a basic strip test and another test where you test CL and Ph using drops of solution. All looks fine I cant give numbers. Maybe I Need to invest on an electronic tester of some sort

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    pwrstrk's Avatar
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    Re: Help Please, what are these stains ?

    Here are the test kits we recommend pool-school/pool_test_kit_comparison
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: Help Please, what are these stains ?

    The stain could also be a copper deposit.

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    duraleigh's Avatar
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    Re: Help Please, what are these stains ?

    Have you attempted to put Vitamin C tablets directly on the stain? Post back if you are not sure how.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  8. Back To Top    #8

    Re: Help Please, what are these stains ?

    Hi

    Tried holding a vit c tab on the stain for a few minutes. No difference. Will be adding metal remover to the water to see if it helps. Will report back here.
    Thanks

  9. Back To Top    #9
    Mod Squad jblizzle's Avatar
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    Re: Help Please, what are these stains ?

    If the vitamin C did not do anything, then the metal remover will not likely either. What product are you thinking of adding specifically?

    What you are stating goes against our recommendation of ONLY adding chemicals to your pool that it needs. Blindly adding a "metal remover" is a waste of money.
    Jason, TFP Moderator
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