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Thread: Brown Stain on Top Step and Gray-ish Stains Elsewhere

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    Join Date
    Apr 2016
    Location
    Houston, TX
    Posts
    51

    Brown Stain on Top Step and Gray-ish Stains Elsewhere

    I've lived in this house with this pool for 2.5 years, but the house is 30 years old, so I assume the pool is also. Not sure when it was last re-plastered, but it's been a long time for sure (I also doubt it's ever been re-tiled, but that's for another discussion). Anyway, there are some very noticeable stains that I am curious about. About 50% of the top step has a brown stain and there are some areas deeper in the pool that have some gray looking stains. I assume the top step stain has to do with sunlight and poor circulation of water at some point, but that's just my guess as a newb. Can anyone tell from the picture what caused these stains and if there's some method to try to remove them or lighten them? If there's no trick, it's all good. I will just live with until I can afford to replaster it.

    14636241438550.jpg
    IG, Plaster, 15,000 gal, Free-form (angular)
    Pentair FNSP 48 DE filter (48 sqft)
    Hayward SP3010X15AZ pump with 1.5 HP motor (installed 3/2015)
    Rock waterfall, large live oak shades half the pool
    Re-plastered April, 2017

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    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Brown Stain on Top Step and Gray-ish Stains Elsewhere

    Is the top step also rough to the touch? Because it looks like Calcium scale (grow your own sandpaper) with algae or dirt embedded in it. You can try sanding on that. I had reasonable luck with drywall sanding screen. Be aware that the stuff does shed and you'll have a lot of silt to vacuum up. To prevent it from happening again, you just maintain the pH and brush the area frequently.

    If it's not rough, then it may be metal stains or organic stains. First test is to set a Vitamin C tablet on the stain for a couple minutes. If it left a white spot where it was, it's metal. There's a pool school article on that. If the pill didn't work, try setting a trichlor puck on the stain for a couple minutes and see if it lightened. If it did, it's organic. Maintaining higher than minimum FC levels and frequent brushing will fade it in a few weeks. Don't leave the puck on there, because they're very acidic. And do the tests in that order, because a trichlor puck may also lift a metal stain and lead you to believe it's something it's not.
    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
    Apr 2016
    Location
    Houston, TX
    Posts
    51

    Re: Brown Stain on Top Step and Gray-ish Stains Elsewhere

    Thanks for the insight, Richard. I'll let you know what I find out

    IG, Plaster, 15,000 gal, Free-form (angular)
    Pentair FNSP 48 DE filter (48 sqft)
    Hayward SP3010X15AZ pump with 1.5 HP motor (installed 3/2015)
    Rock waterfall, large live oak shades half the pool
    Re-plastered April, 2017

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