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Thread: Stains versus Mustard

  1. Back To Top    #1

    Join Date
    Jul 2010
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    Stains versus Mustard

    My pool is crystal clear and the overnight FC does not change. All drop test are normal except CH is 360

    In the deep end I see a couple of spots that are brownish/yellow. These spots do not change when I brush them with a wire brush and do not appear to be growing or changing.

    How do I differentiate between stains or MA? If stained how do I get rid of them?
    17,000 gal in ground with spa, wet edge surface, Paramount PCC 2000 in-floor cleaner,Pentair Clean and Clear Plus 520 Cartridge filter, 3 hp Pentair Intelliflo VS SVRS pump , waterfall with 1 1/2 hp booster, Del ozone Eclipse1 ozonator, puck feeder. Borates added 8/2/2010

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    Re: Stains versus Mustard

    MA would brush off.

    A complete test results is needed. Your hardness level is a bit on the high side and if the pH and/or Alk levels are too high, scale will form.

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

  3. Back To Top    #3

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    Re: Stains versus Mustard

    Agree with PoolGuyNJ in that we need to see the test numbers.

    Are the spots in question raised? Any chance that they could be metal stains?

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    Re: Stains versus Mustard

    OK here are the results. FC 7.5 put in 2 quarts at 4pm. CC 0.5 pH 7.5 T/A 130 CH 320 CYA 50 Temp 91 degrees

    The spots don't appear to be raised. I haven't used any copper based algaecides but I am not aware of metal in my water but I guess they could be metal. How can I tell?
    17,000 gal in ground with spa, wet edge surface, Paramount PCC 2000 in-floor cleaner,Pentair Clean and Clear Plus 520 Cartridge filter, 3 hp Pentair Intelliflo VS SVRS pump , waterfall with 1 1/2 hp booster, Del ozone Eclipse1 ozonator, puck feeder. Borates added 8/2/2010

  5. Back To Top    #5
    frustratedpoolmom's Avatar
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    Re: Stains versus Mustard

    Hold a Vitamin C Tablet on the stains. If they are iron, they will fade rather quickly. If they are copper, they may change in appearance or darken...

    A trichlor tablet held on the stain, if it fades, would mean the staining is organic.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  6. Back To Top    #6

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    Location
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    Re: Stains versus Mustard

    These spots are in the deep end. How long do I hold the different substances to the spot?
    17,000 gal in ground with spa, wet edge surface, Paramount PCC 2000 in-floor cleaner,Pentair Clean and Clear Plus 520 Cartridge filter, 3 hp Pentair Intelliflo VS SVRS pump , waterfall with 1 1/2 hp booster, Del ozone Eclipse1 ozonator, puck feeder. Borates added 8/2/2010

  7. Back To Top    #7
    frustratedpoolmom's Avatar
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    Re: Stains versus Mustard

    Vitamin C will work almost immediately if its iron. The others could take longer. You may have to try to figure out a way to hold the tablets on the spots...
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  8. Back To Top    #8

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    Re: Stains versus Mustard

    Crush the tabs, put the powder in a nylon sock with a rock in with it to hold it down.

    Added:

    I suspect scale though. If nothing happens with either the Vit. C or trichlor tab, it's a good bet.

    If you could post a pic...

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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