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Thread: TFT...DPD R-870 Powder Question

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    Crzyfrlss1's Avatar
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    TFT...DPD R-870 Powder Question

    This is a simple one.

    What exactly is a heaping scoop of this anyway?

    I'm finding that the results between the DPD and OTO test vary a bit.

    A picture would be quite helpful.
    Intex 15' X 48" metal frame pool
    Waterway Supreme 1hp 2 Speed pump
    Hayward X-Stream 150 Sq. Ft. Cartridge Filter
    2-2'x20' Sungrabber Solar Panels hooked up in parallel on a Goldline GL-235 controller.

    Not getting "Pool Stored" = Priceless!!!
    Thank you TFP

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    Butterfly's Avatar
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    Re: TFT...DPD R-870 Powder Question

    One heaping (heaped up amount that will stay put without falling off before getting to destination) OR, two level scoops. They are about the same amount.
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    dmanb2b's Avatar
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    Re: TFT...DPD R-870 Powder Question

    The OTO test IMHO is not very good and I can never tell the different shades of yellow. Also OTO tests for TC not FC and CC seperately, so results will vary a bit if CC is present. One heaping scoop is in fact a rounded scoop, but if the sample turns solid pink, you have enough powder in the sample
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    Crzyfrlss1's Avatar
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    Re: TFT...DPD R-870 Powder Question

    Well I guess both of you explained it well enough that no picture is needed.

    I have never needed to shock the pool except on opening...I leave it up and uncovered during winter, 4 years now.
    Intex 15' X 48" metal frame pool
    Waterway Supreme 1hp 2 Speed pump
    Hayward X-Stream 150 Sq. Ft. Cartridge Filter
    2-2'x20' Sungrabber Solar Panels hooked up in parallel on a Goldline GL-235 controller.

    Not getting "Pool Stored" = Priceless!!!
    Thank you TFP

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    Re: TFT...DPD R-870 Powder Question

    I always think of the OTO test as checking for the presence of adequate chlorine. It's almost surefire for that. The FAS/DPD is virtually mandatory to complete the shock process and on days when you want to calculate something and need a VERY accurate result
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Crzyfrlss1's Avatar
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    Re: TFT...DPD R-870 Powder Question

    After using the TFT for awhile now I can sort of see a trend as to how my chem. balances are and how my pool behaves.

    I lose about 2 ppm daily in CL with CYA @ 30

    TA is usually steady @ 100 and ph stays around 7.6-7.8

    I like my ph around the upper range because it reduces the eye irritation.


    All seems to be well, I just wanted to be sure I was testing with the DPD correctly as it is the most important test to me.

    Thanks for the responses everybody!
    Intex 15' X 48" metal frame pool
    Waterway Supreme 1hp 2 Speed pump
    Hayward X-Stream 150 Sq. Ft. Cartridge Filter
    2-2'x20' Sungrabber Solar Panels hooked up in parallel on a Goldline GL-235 controller.

    Not getting "Pool Stored" = Priceless!!!
    Thank you TFP

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