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Thread: Black stains on all White PLASTIC/PVC surfaces

  1. Back To Top    #1

    Join Date
    May 2011
    Location
    Clifton, NJ
    Posts
    14

    Black stains on all White PLASTIC/PVC surfaces

    I am getting a black stain on the 3 discharge jets, 2 wide mouth skimmers, and now the 2 screened returns in the deep end.

    My readings for the pool are:

    Fc - 9
    pH - 7.8
    TA - 70
    CH - ~100
    CYA - 65
    Salt - 3200

    I noticed this last season and it was very mild compared to this season.
    I don't know what could be causing this or how to address this issue.
    A friend advised I have the SWG cell cleaned but I doubt that would do it.

    Any advice would be appreciated .

    Thank you

    Kevin
    22K gal, DE, IG Vinyl, Hayward Super Pump 1 1/2 HP@50 GPM, SWG - Gold Line Aqua Rite AQR w/ T-15 Cell.

  2. Back To Top    #2
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Black stains on all White PLASTIC/PVC surfaces

    Welcome!

    Have you ever used any algaecides or mineral systems in your pool? Metals are the most likely cause. Find some Vitamin C tablets and set one on the black spot for about fifteen minutes and see if it leaves a white spot.
    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!

  3. Back To Top    #3

    Join Date
    May 2011
    Location
    Clifton, NJ
    Posts
    14

    Re: Black stains on all White PLASTIC/PVC surfaces

    Ok I will do that and let you know.

    Thank you
    22K gal, DE, IG Vinyl, Hayward Super Pump 1 1/2 HP@50 GPM, SWG - Gold Line Aqua Rite AQR w/ T-15 Cell.

  4. Back To Top    #4

    Join Date
    May 2011
    Location
    Clifton, NJ
    Posts
    14

    Re: Black stains on all White PLASTIC/PVC surfaces

    I placed the Vitamin C tablet on the skimmer and it did leave a white spot.
    I usually had the pool opened by the company that installed it 2 years ago. Every opening I believe they did put a Algaecide and a water Clarifier in. I know this because they always left me the empty containers. This is the first year I opened it myself and did not use ANY chemicals upon opening. I turned on the pump for 3 days strait and turned the SWG to Super Chlorinate.
    Did I over look something?
    22K gal, DE, IG Vinyl, Hayward Super Pump 1 1/2 HP@50 GPM, SWG - Gold Line Aqua Rite AQR w/ T-15 Cell.

  5. Back To Top    #5

    Join Date
    Jun 2013
    Location
    Erie pa
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    68

    Re: Black stains on all White PLASTIC/PVC surfaces

    Some algaecides contain copper, maybe thats the problem.
    16x32 vinyl ig with foxguard steel walls,gli liner ,hayward de filter,hayward heatpro heat pump,hayward colorlogic 4.0 led.pentair circular weir skimmers.hayward sharkvac xl robot,gli mesh cover.polk atrium speakers,sonos music system.erie pa.

  6. Back To Top    #6

    Join Date
    May 2011
    Location
    Clifton, NJ
    Posts
    14

    Re: Black stains on all White PLASTIC/PVC surfaces

    It could be.

    So far the Vitamin C helped clean the stains when I rubbed it on the stained surfaces. The stains have not returned yet, maybe too soon to notice.
    I just need to determine the correct approach to this issue"$$$"

    I have just read this article - pool-school/metal%20stains

    Which leads to this Solution: ascorbic-treatment-to-rid-pool-of-metal-stains-t2298.html
    22K gal, DE, IG Vinyl, Hayward Super Pump 1 1/2 HP@50 GPM, SWG - Gold Line Aqua Rite AQR w/ T-15 Cell.

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