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Thread: Staining/Scale Issues Help Needed

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    Join Date
    Sep 2016
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    Debary/FL
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    Staining/Scale Issues Help Needed

    My wife and I recently purchased a home with a "pond" in the backyard which was once a pool. It sat full of rain water for almost two years until we recently pumped it out with a sump pump, hosed the walls and added the proper chemicals to get it back to being a pool. However, after several months of shocking and keeping the water at the proper levels we are still noticing staining on the walls and what I'm assuming is scale. Before I go jumping into metal cleaners and stain removers I thought I would check on here to see if anyone could better help identify what the staining may be and any possible solutions there are to help get the pool looking better. The dark spots on the wall did have some sliminess over it and I've kept the chlorine at shock level until the FC no longer dropped overnight. I've also brushed the walls at least once a day. The stains however have seemed to stop dissipating any further. Any help you could provide would be greatly appreciated.

    IMG_5170.jpgIMG_5328.jpgIMG_5333.jpgIMG_5367.jpgIMG_5369.jpg
    11,000 Gallon Concrete Pool
    Pentair Motor/Pump
    Pentair Cartridge Filter
    Taylor K-2006 Kit

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    Join Date
    Sep 2016
    Location
    Debary/FL
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    Re: Staining/Scale Issues Help Needed

    Sorry forgot to post pool test numbers...

    FC- 4.8
    CYA- 40
    TA - 120
    CH - 180
    PH - 7.5
    CC - <.5
    11,000 Gallon Concrete Pool
    Pentair Motor/Pump
    Pentair Cartridge Filter
    Taylor K-2006 Kit

  3. Back To Top    #3
    Mod Squad pooldv's Avatar
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    Re: Staining/Scale Issues Help Needed

    Welcome to TFP!

    That looks like algae and slimy indicates that it is algae also. To check for scale you can put dry acid in a sock and rub it on the stain to see if it will dissolve it. You can rub a trichlor puck on it to see if it is an organic stain.

    More about scale here, Pool School - Calcium Scaling
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    Re: Staining/Scale Issues Help Needed

    Thanks. I've purchased a steel brush and have been working on the "slimy" areas. Now those are gone and the dark black spots as well. However, a majority of the staining on the bottom and the calcium deposits on the wall are all still there. I'm planning on addin a multi stain remover and some scale remover to see if this works. If it doesn't does anyone else have any suggestions such as acid washing or something less abrasive to try?

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    Mod Squad pooldv's Avatar
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    Re: Staining/Scale Issues Help Needed

    You can lower your CSI to -0.8 to -0.9 and brush as often as you can stand to. It is a fairly slow process. More details in the link I posted in my last post.

    The next option is a no drain acid bath, The Zero Alkalinity Acid Treatment

    Then the last resort is a an acid wash.
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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