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Thread: Bromine and pH

  1. Back To Top    #1

    Join Date
    Jun 2014

    Bromine and pH

    Is the conversion bromine-bromide (under sunlight) affected by pH? What other factors might influence the bromine stability?
    South of France inground rectangular 17k pool - ruber membrane. Sliding dome, black thermal blanket covering 75% of the pool surface. Aqualux 3/4Hp pump, glass media sand filter, Zodillac robot, 110W UV-c lamp, Hayward brominator, Caliente 12kW heat pump.

  2. Back To Top    #2

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Bromine and pH

    The breakdown of bromine to bromide by the UV in sunlight isn't affected much by pH at the ranges found in pools because most of the bromine is in the form of hypobromous acid and not hypobromite ion. This is different than chlorine that splits evenly between the two near a pH of 7.5 so the relationship is more affected by pH as a result.

    Unfortunately, we don't have good numbers for the rate of bromine breakdown in sunlight but a rough analysis shows that it is slower than chlorine with no CYA but faster than chlorine when CYA is present. This is why a bromine pool tends to use more oxidizer to maintain a bromine level and to be somewhat more expensive to operate. It depends, though, on whether bromine tabs are used since they add DMH to the water and that may act somewhat like CYA in binding to bromine though perhaps no as strongly so only noticeable at higher levels.
    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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