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Thread: Which test is giving me the accurate FC reading?

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    Join Date
    Jun 2013
    Orange County, NY

    Which test is giving me the accurate FC reading?

    This is my second season using the Taylor TF-100 kit + K-1000, so I'm pretty comfortable using it. The start of this season I got a full refill of everything, so all regents are brand new. I also had a pool store test the water, and I have two different brands of test strips that are also brand new. Here is what I am getting:

    K-1000 FC = 4
    Chlorine drop test FC = 3.5
    Pool store FC = 0.75
    LaMotte test strips FC = 1
    Taylor test strips FC = 1

    How do I know which is correct?
    - Max
    20k gal, inground vinyl, 1 1/2 HP Hayward SuperPump, HW Veriflow XL Sand Filter, Hayward Aqua Rite T-Cell-9, AquaComfort Heat Pump ACT-1100
    Hayward TigerShark robotic cleaner

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Which test is giving me the accurate FC reading?

    FAS-DPD no question!
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Join Date
    Jun 2011
    Long Beach, CA

    Re: Which test is giving me the accurate FC reading?

    There is a reason why the TF-100 is a recommended test kit and that is due to the FAS/DPD test. It is the most accurate of all those tests, and it measures FC up to 50ppm.

    The K-1000 is so so up to 5ppm, but even that is more of do I have FC or not.

    Pool store and test strips I'll put in the same category, you never know if it is right or wrong and most of the time it will be wrong.
    16k gal plaster with raised spa, Jandy DEV60 filter, 2 HP 2-speed SHPF Jandy Stealth pump
    Hayward Aqua Rite T-15 SWCG, Jandy LXi 400k BTU NG heater, 350 sq.ft. of Sun Star solar panels, TF-100 Test Kit, Dolphin s300i Cleaner
    Test Kits . Pool Math . Chlorine/CYA Chart . The SLAM Process

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    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Central Minnesota

    Re: Which test is giving me the accurate FC reading?

    The TF-100 FAS/DPD test is the accurate number. The K-1000 is only as accurate as your eye is able to interpret. In this case, you now know what 3.5 should look like on your K-1000. Pool store/test strips are different than the other two by a measureable/significant amount. Now you know why we recommend proper test kits.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    In the Industry

    Donldson's Avatar
    Join Date
    Jun 2009
    NW Ohio

    Re: Which test is giving me the accurate FC reading?

    My favorite part of your test is how the test strips and pool store are all close... and all way wrong. This is why when someone new comes to the site and gives us test strip results "confirmed by the pool store" or vice versa we still can't accept that as accurate. There are no tests on the residential market that rivals the accuracy of the FAS-DPD test.

    As for the OTO test in the k-1000, it tests free chlorine. So between the possibility of misreading the color and the possibility that you have up to 0.5 CC then I would say it gave you a pretty good confirmation of your FAS-DPD results.
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter. Dual speed 1 HP pump, Hayward S210T sand filter
    Pool School - PoolMath - HIGHLY Recommended Test Kits

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    Patrick_B's Avatar
    Join Date
    Jun 2011
    Midland TX

    Re: Which test is giving me the accurate FC reading?

    Quote Originally Posted by Bama Rambler View Post
    FAS-DPD no question!

    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

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