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Thread: Chlorine Test

  1. Back To Top    #1

    Join Date
    Jun 2015

    Chlorine Test

    What is the difference between a DPD and a FAS-DPD chlorine test kit?
    25x16 rectangular in ground pool with vinyl liner (14,000 gal). Sta-Rite sand filter. 1HP single speed Max-E-Pro pump. Pool owner since 2013.

  2. Back To Top    #2
    BoDarville's Avatar
    Join Date
    Jun 2012
    DFW, Texas

    Re: Chlorine Test

    The FAS-DPD test uses both a powder and a liquid reagent whereas the DPD uses only a liquid reagent. The big advantage of the FAS-DPD test is that it can read FC levels up to 50 ppm. In contrast, the DPD can read FC levels up to 5 ppm although it can read higher FC levels if you are willing to use diluted water samples. However, doing that can introduce more inaccuracies.

    The FAS-DPD chlorine test is the one you want if you desire to follow our methods.

    More information is available here: Extended Test Kit Directions - see posts 3 and 4.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
    A good test kit is an investment, not an expense.

  3. Back To Top    #3
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: Chlorine Test

    You can read about all the chlorine tests here: Extended Test Instructions
    Jason, TFP Moderator
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