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Thread: DPD test, Is it Desolved?

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    DPD test, Is it Desolved?

    I've been using the K-2006 kit for a couple years now. During my DPD test I've let the sample sit a few minutes, and notice the pink tint returns. Is this due to the FAS-DPD evaporating or the powder is not fully desolved?
    15300 gal. Trevi, 1.5 hp Power Flo Matrix, Perflex EC40AC DE filter

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    Divin Dave's Avatar
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    Re: DPD test, Is it Desolved?

    I cannot technically tell you why this happens, but it does. Has nothing to do with having enough powder or being fully desolved.

    When you do the test and let the sample sit, it will turn pink again. This is why you need to do the CC test immediately after the FC test.
    You get a false CC test result if you wait too long.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
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    Mod Squad tim5055's Avatar
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    Re: DPD test, Is it Desolved?

    Quote Originally Posted by Divin Dave View Post
    I cannot technically tell you why this happens, but it does. Has nothing to do with having enough powder or being fully desolved. .
    When in doubt I always look to Richard's (Chem Geek) posts....

    Quote Originally Posted by chem geek View Post
    Taylor website, they have some interesting Q&As such as the following:

    In the FAS-DPD test if you wait too long after the sample turns clear, it may turn light pink again. This can be caused by oxygen in the air oxidizing the DPD dye.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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