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Thread: Rust Spots

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    Question Rust Spots

    I just purchased a new home that has an in-ground pool. I noticed that there are a bunch of what looks to be rust spots. There seems to be more and more as time goes on. I was told that the pool has a diamond bright finish. I was under the impression that diamond bright finishes do not rust. I am not sure what the problem is. Any suggestions would be great.



    8k In-ground concrete / Diamond Bright
    Hayward Cartridge filter Model C9002
    Hayward pump/ Century motor Model UST1102
    TF-100 Test Kit

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    Mod Squad YippeeSkippy's Avatar
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    Re: Rust Spots

    How about getting a water sample and running down to the pool store and asking them to run a test for metals?

    Do you know if any copper algaecide has been used in the pool??

    Get some Vit C tablets and hold it against the stain and see if it disappears. If it does, you have metal staining.
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
    Our pool build--> Our Pool Solved Our Sloping Yard Skippy's Cheap Pool Cooler -->Skippy's New Fountain

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    Re: Rust Spots

    I ordered the TF-100 test kit and here are the results I came up with:

    Cl/BR seems to be off the charts and the PH is at 7.2


    Chlorine test FC 21.5ppm
    Total Chlorine - No CC

    Calcium hardness 525ppm

    TA- 90
    CYA- 90

    - - - Updated - - -

    Thanks Yippe, I have a pinch a penny about a mile from here. I am assuming they could probably test for metal.
    8k In-ground concrete / Diamond Bright
    Hayward Cartridge filter Model C9002
    Hayward pump/ Century motor Model UST1102
    TF-100 Test Kit

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    Mod Squad YippeeSkippy's Avatar
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    Re: Rust Spots

    Wowsa! I don't think I've ever seen the OTO block with red on the chlorine side??

    As to the scary looking low pH-->with that high of FC, your pH is NOT accurate. <whew!>

    Have you been using CalHypo to chlorinate??
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
    Our pool build--> Our Pool Solved Our Sloping Yard Skippy's Cheap Pool Cooler -->Skippy's New Fountain

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    Re: Rust Spots

    I also have a questions about checking the calcium hardness. The index card that comes with the kit has a different test than that of the youtube video here:
    Calcium Hardness with the TF-100 - YouTube

    If I use the test method that comes with the kit I get 525ppm, with the test method in the video I get 450ppm. I can see the color change a lot easier with the video method but it does use more reagent. Which test method do you guys think is more accurate?
    8k In-ground concrete / Diamond Bright
    Hayward Cartridge filter Model C9002
    Hayward pump/ Century motor Model UST1102
    TF-100 Test Kit

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    Mod Squad YippeeSkippy's Avatar
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    Re: Rust Spots

    Wow- it was almost painful to watch all that manual swirling. Get that man a magnetic stirrer!

    I'm not sure what your index card instructions say because mine call for it to be performed exactly like the video.
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
    Our pool build--> Our Pool Solved Our Sloping Yard Skippy's Cheap Pool Cooler -->Skippy's New Fountain

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    Re: Rust Spots

    Hey Yippe, the old home owners were using Pool Time 3" tablets Plus.
    Pool TimeĀ®, Sanitizers - 3" Tablets PlusĀ®

    Here is the MSDS:
    http://www.homedepot.com/catalog/pdf...8f82a0563f.pdf

    - - - Updated - - -

    What does the red mean on the chlorine side? Is it high or low? Sorry for all the questions haha. This is the first time I've owned a pool.
    Last edited by johnboy85; 08-17-2015 at 11:59 PM. Reason: Updated
    8k In-ground concrete / Diamond Bright
    Hayward Cartridge filter Model C9002
    Hayward pump/ Century motor Model UST1102
    TF-100 Test Kit

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    Re: Rust Spots

    haha yeah, I purchased the magnetic stir also, it works great.
    8k In-ground concrete / Diamond Bright
    Hayward Cartridge filter Model C9002
    Hayward pump/ Century motor Model UST1102
    TF-100 Test Kit

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    Re: Rust Spots

    Here is what my index card says for the calcium hardness test:
    fill cylinder with pool water to the 10ml mark,
    Add 10 drops of R-0010 and mix,
    3 drops of R-0011L
    Add R-0012 one drop at a time until the color changes blue
    Multiple the number of drops x 25

    Here is what the Youtube video says for the calcium hardness test:
    fill cylinder with pool water to the 25ml mark,
    Add 20 drops of R-0010 and mix,
    5 drops of R-0011L
    Add R-0012 one drop at a time until the color changes blue
    Multiple the number of drops x 10
    8k In-ground concrete / Diamond Bright
    Hayward Cartridge filter Model C9002
    Hayward pump/ Century motor Model UST1102
    TF-100 Test Kit

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    Mod Squad jblizzle's Avatar
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    Re: Rust Spots

    There is no need to be that accurate with the CH test. The TF-100 instructions recently were changed to the 10ml water sample add that is good enough and gives you more tests.

    The OTO tests turns orange like that at higher chlorine levels. Like you found your FC is over 20ppm.

    With high FC over 10ppm, the pH test reads higher than reality. That worries me that your pH might be really really low.
    Jason, TFP Moderator
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    Isaac-1's Avatar
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    Re: Rust Spots

    See this old thread that talks about off the scale reading on the OTO Chlorine test Extended OTO color comparator?


    As to the spots they may very well be rust spots precipitating out of the water due to the VERY high Chlorine level, there are any number of possible sources for the metals including fertilizer for the grass getting blown into the pool.
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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    Re: Rust Spots

    What should be the next step that I focus on? It has been raining here like crazy, should I just leave the pool alone and see if the chlorine drops and then address the PH if it's low? I see that my CYA is high, should I address that first? Not really sure where to go from here.
    8k In-ground concrete / Diamond Bright
    Hayward Cartridge filter Model C9002
    Hayward pump/ Century motor Model UST1102
    TF-100 Test Kit

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    Isaac-1's Avatar
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    Re: Rust Spots

    Stop adding Chlorine until it gets down to sane levels, if it were mine I would start with water replacement to bring the CYA down to something reasonable right away, given you are in FL I would aim for 50 ppm CYA, this will require replacing about 1/3 of your water. This assumes you are going to continue to manually add chlorine, if you plan to switch to a SWG for chlorination your CYA target should be around 70. Once the water is back up to its normal level adjust pH as needed.

    Ike

    p.s. to be safe if you have a high water table, you might want to do 2 smaller drains and refills to lower the chance of your pool floating out of the ground
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
    ~Remember TFP counts on your donations to keep this site ad free~

  14. Back To Top    #14

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    Re: Rust Spots

    Hey thanks guys for all the info.
    8k In-ground concrete / Diamond Bright
    Hayward Cartridge filter Model C9002
    Hayward pump/ Century motor Model UST1102
    TF-100 Test Kit

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