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Thread: Have stains in my pool, now what??

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    Have stains in my pool, now what??

    Our pool is open, cleaned, and balanced.
    What I was thinking were dirt stains, are something else entirely.
    After reading up in Pool School on my problem, I figured out it has to be metal staining.
    My Alkaline lever were way low (40 - 50)
    I have it up to 60 - 70, still have to get some more baking soda in order to get it up a bit more.
    My question is, do I need to add a sequeterant or will the stains fade by themselfes over time with the proper water balance?
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    Texas Splash's Avatar
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    Re: Have stains in my pool, now what??

    Hello. Often in the case with metals in the pool, a type of sequestrate is recommended. Keep in mind however that a metal sequestrant holds onto metals to prevent them from staining pool surfaces. It's only needed if you've got metals (iron, copper, manganese) in your water, such as sometimes occurs in well water. So if you truly do have metal levels in the water, a sequestrant may be just for you. As for the staining, there are different methods posted on this site to address stains, each different upon the type of pool

    To assist you better, you might want to clarify a couple things for us since I'm sure others will be looking for these answers as well to give you the best reply:
    - How do you know (for sure) you have metals? Was the water actually tested locally by someone (i.e. type metal, levels, etc)
    - Do you have your own regular test kit? If so, what kind is it please?
    - Please post a full set of your own test numbers so we can compare to the rest of your water quality.

    Your response(s) should help get us on track to better assist you.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    Re: Have stains in my pool, now what??

    Thank you for your reply.
    I did not have the water tested for metals.
    I noticed some stains in my pool last year, but was thinking that I got some deck stain splashed into the water while sealing our wood deck.
    When I opened the pool this spring, the stain was everywhere, exept were some leaves were on the bottom while the cover was on all winter long.
    At first I thought it was dust, or dead algea that would vaccum up, but no luck. I scrubbed and shocked.
    My 2nd thought was bleached liner. I looked at some images of that, wasn't it.
    Looked at other possible stain images. Everything pointed to metal stains.
    "Where in the world woul I get metal stains from???" I filled with tap water years ago, only refilled every year during opening, always from the waterhose. We are on city water.
    I read here that it is possible to have metals in the water without knowing. But it is noticable when the TA is way to low. So I checked my level, and it was 40!!! I never checked before.
    After adding baking soda to raise it to 70, I don't know if I need to get it higher or not.
    My water is crystal clear.

    Here are the other numbers
    FC 5.5
    CC 0
    PH 7.6
    TA 70
    CH vinyl pool
    CYA 55
    Salt added 3 bags of Diamond Crystal 40-lbs Salt Pellets
    Temp 84

    The stains are still there. I suspect metal stains, just from looking at other images, but don't know 100%

    Thanks in advance for any help.
    12500 AGP 2HP Sand filter
    Five years on BBB & loving it!

  4. Back To Top    #4
    Mod Squad pooldv's Avatar
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    Re: Have stains in my pool, now what??

    TA of 70 is ok. Do you have an ionizer? Mineral system? SWG with copper bars? You can take some water to the pool store to have them test for metals.

    Here is a link to the Pool School - Metals in the Water and Metal Stains
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    Texas Splash's Avatar
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    Re: Have stains in my pool, now what??

    I agree. If you still think you may have metals in the water, going to the pool store to test for metals is one of the very few things we recommend going there for. Just remember to close your ears when they give advice about anything else. Your testing above looks quite solid.

    By the way....... I don't think we ever asked this question earlier ..... you never put any type of unusual pool store chemicals in your pool before did you (i.e. algaecide)? Some of them have been known to add metals is why I ask.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  6. Back To Top    #6

    Join Date
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    Re: Have stains in my pool, now what??

    I did put some algecide in one year. It was the Polyquat60.
    Other than that, only bleach, salt, and Muric Acid. And now baking soda.
    I will take some water to the store next week.
    12500 AGP 2HP Sand filter
    Five years on BBB & loving it!

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