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Thread: FAS-DPD testing with bromine

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    FAS-DPD testing with bromine

    Chemgeek wrote
    Note that the test is measuring Total Bromine and there is no need for the R-0003 reagent. Combined Bromine is automatically measured in the first part of the test since monobromamine is in equilibrium with a more reactive monobromammonium ion that reacts with the dye in the test. It is this reactivity that makes the combined bromine still effective as a disinfectant (though monobromamine can smell if it gets high enough in concentration).
    I've been using my TF100 all season on our indoor pool (not spa) and usually have to add another drop of the R 0871 after adding the R0003, so I include the last drop into my total bromine. I almost always get a little pink from adding the 5 drops of R0003.

    Am I doing something wrong to get a result out of the R0003?
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

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    AClogston's Avatar
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    Re: FAS-DPD testing with bromine

    Do you use MPS shock in this pool?

    MPS will give a false high CC reading. I had to buy the special Taylor FAS-DPD kit because of this.
    -Alex
    Outdoor Chlorine Pool/Spa (~100' from pump room):(35,000gal IG, plaster, 2 Triton TR-140 sand filters, 2 2HP pumps),(1,200gal IG, plaster, Triton TR-140, 2.5HP pump [circ.], 2 2HP pumps [jets])
    Indoor Bromine Pool/Spa:(24,000gal, plaster, Triton TR-100, 1.5HP SVRS-equipped pump),(3,200gal w/ 3 waterfalls, plaster, Sta-Rite System 3 cartridge filter, 3HP pump [circ.], 3HP pump [jets])

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    Re: FAS-DPD testing with bromine

    Hey Al

    As a general rule, I don't shock my pools - because I don't have to

    However, my predecessor used to use it, last year - would it stay in the water (70% changed to start the pool this spring) that long?? [also, sometimes I don't get the cc (cb) reading]

    Thanks for all replies
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

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    Re: FAS-DPD testing with bromine

    What you're seeing is combined chlorine - some formulations of bromine include chlorine, first the chlorine sacrifices itself to oxidize the bromide ions into hypobromous acid. Then whatever chlorine is left combines with any organics and thus reacts with the R-0003 as combined chlorine. Combined bromine and free bromine have similar oxidizing capabilities that why you test for "total bromine".

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    Re: FAS-DPD testing with bromine

    It's also possible for it to be an organic combined bromine (rather than the inorganic monobromamine) in which case I wouldn't count that as far as being bromine that you want since it is probably not a disinfectant. Unless that was rather high, I wouldn't worry about it.
    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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    Re: FAS-DPD testing with bromine

    Thanks guys!

    Sorry for the delay but.. things have been a little crazy at work the past couple of weeks - I've had to take on responsibilities that aren't in my job description (haven't we all, at one point or another )

    Again, THANK YOU!!
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

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