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Thread: Need to add more sodium bromide

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    Modawg2k's Avatar
    Join Date
    May 2013
    Phoenix, AZ

    Need to add more sodium bromide

    My 425 gallon tubs needs about 2.5 ounces of sodium bromide at startup. I only have 0.8oz right now and I'm unable to get to the store. I do have Leisure Time bromo tabs, and if I understand correctly, I can use those to help with my bromide reserve, it'll just take a little bit to convert. Any idea how many tabs I can crush and throw into the water? Thanks
    ~15k gallons, 3'-5'-4' Figure 8 Shape In Ground
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    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Central Minnesota

    Re: Need to add more sodium bromide

    You could just add some tabs to a floater and maintain bromine levels with that for about a week or so, depending on usage. After 2-3 tablets have fully dissolved, you'd have a sufficient bromide reserve, assuming it is BCDMH (Bromochloro-5,5-dimethylhydantoin) based tablets. If you don't have an ozonator, you'd likely not have to intentionally add any more tablets or bromide until you drain and refill. If you have an ozonator, bromide is slowly broken down and you may have to add more over time. There is no direct way to measure bromide from what I know and if you shock with bleach, you can't tell if you're measuring free bromine or free chlorine if the bromide bank is exhausted.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
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    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Need to add more sodium bromide

    There's a rather complicated way to determine the bromide bank by using ammonia, forming bromamine, and using an ammonia test kit (which explicitly tests for monochloramine), but it's not worth describing in detail.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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