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Thread: Plaster stains

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    Plaster stains

    I have several stains on my plaster. They come and go but really have been there for about 6 months or so.
    I checked the forum and tried the vitamin c and trichlor test.
    Both did not lighten the stain.
    They become lighter during sunny day and more prominent earlier or later in day.
    I do have an oak tree near the pool however I never let any leaves or other drift stay in pool very long.

    I should also note that my PH did get above 8.0 on couple of occasions when I was out of town.
    So, not sure if I should begin shock treatment or absorbic acid treatment?

    Here are my numbers;
    FC 8
    PH 7.7
    TA 110
    CH 320
    CYA 40

    Here are a few pics.
    Thanks for any help.
    Attached Images Attached Images
    20'x 40'--27,000 Gal--Plaster Pool
    Sand Filter, IG, Aqua Rite SWG

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    frustratedpoolmom's Avatar
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    Re: Plaster stains

    I think you may be dealing with tannin stains. AA won't help. What did you do with the trichlor, when you tested with it? If you can give a bit more detail on how you tried it out, maybe we can suggest your next steps.
    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

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    Melt In The Sun's Avatar
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    Re: Plaster stains

    How about acorns? I agree that they look like tannin stains, which chlorine will remove. The fact that they come and go also sound like tannins.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
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    Re: Plaster stains

    I get those from my wax myrtles dropping crud into the pool. Run your FC at 1 or 2 ppm higher than you usually do and the stains will be gone in no time.

  5. Back To Top    #5

    Re: Plaster stains

    I placed tricolor puck on top of stain for 45 minutes.
    Same for vitamin c tablets.
    I do have an oak tree nearby but acorns never stay in pool.
    I always get them out.
    By the way I have been running FC around 5-9 for month now.
    Doing nothing to stains.
    Might mention that ph got over 8 couple of times when I was out of town.
    What is tannin stain????
    20'x 40'--27,000 Gal--Plaster Pool
    Sand Filter, IG, Aqua Rite SWG

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    frustratedpoolmom's Avatar
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    Re: Plaster stains

    tannin is organic...the trichlor should have done something.
    Did the vitamin c change the appearance in any way, like darken the spot?
    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

  7. Back To Top    #7

    Re: Plaster stains

    The vitamin c did really nothing.
    However should note that they were the small caplets vitamin c.
    should i have used something else?
    20'x 40'--27,000 Gal--Plaster Pool
    Sand Filter, IG, Aqua Rite SWG

  8. Back To Top    #8

    Join Date
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    Re: Plaster stains

    Those are not iron stains. They are acorn stains. They will fade over time.

    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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    frustratedpoolmom's Avatar
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    Re: Plaster stains

    I'm inclined to agree with Scott. I was asking about the vit c because if it was copper the stain might get darker.
    I would go ahead and try to keep the chlorine slightly elevated by 2-3 ppm more than normal and then see if they begin to fade.
    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

  10. Back To Top    #10

    Re: Plaster stains

    Thanks for the info.
    They do fade big time during the day and more prominent during dusk.
    Should I use pool calculator to find shock limit and keep C that high??
    I am at 9 right now and will keep it that high, brush and keep going.
    Should I use any type algae treatment now?
    Since with BBB I have not used any algae treatment for around a year.
    20'x 40'--27,000 Gal--Plaster Pool
    Sand Filter, IG, Aqua Rite SWG

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