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Thread: SWG and bromine

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    SWG and bromine

    I bought a house this past winter and it has an in-ground pool. The former owners used bromine. I have been using chlorine, as guided by the advice on these forums. And the pool water looks and tests fine. Because we are away from the house for 5 days every week, I have had some challenges trying to keep chlorine levels stable during those absences. A couple people on these forums have suggested a salt water generator. As I look into it, some SWG suppliers say you should not use their SWG until bromine levels are very low. I don't want to get a SWG and then screw it up because there's Br in the water.

    So my question is how do I know if the Br level is very low? For example, there have been times when my FC level (using the TFT-100's OTO and FAS/DPD reagents) has been undetectable. Am I right that those tests measures both Cl and Br? And if the level was undetectable, does that mean there's no Br in the pool?

    Thanks for your help.
    Tom RI

    20,000 gal inground vinyl liner
    Jacuzzi pump and filter with Hayward feeder

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    JasonLion's Avatar
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    Re: SWG and bromine

    It isn't easy to measure the bromide level, which is what matters here. You can get an approximate result by letting the FC/Br level fall to zero and then adding MPS. MPS will convert bromide to bromine, but not show up in the test it's self, and you can then test the bromine level. That approach has some pitfalls, but still works as a fairly good is there bromide or not check.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: SWG and bromine

    What is MPS? Is it a reagent that's in my TFT-100 kit?

    Then after adding MPS, how do you measure bromine? With the standard OTO or FAS/DPD.
    Thanks your help.
    Tom RI

    20,000 gal inground vinyl liner
    Jacuzzi pump and filter with Hayward feeder

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    JasonLion's Avatar
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    May 2007
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    Re: SWG and bromine

    MPS is the most common kind of non-chlorine shock, technically potassium monopersulfate.

    You can measure bromine with the FC portion of the FAS-DPD test.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: SWG and bromine

    I don't have any MPS. But I guess I could run the test you propose using hydrogen peroxide as the oxidizing agent, right?
    I'll try this out the next time I find the chlorine level undetectable. I'll report the results here.

    Thanks again Jason.
    Tom RI

    20,000 gal inground vinyl liner
    Jacuzzi pump and filter with Hayward feeder

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