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Thread: How to test high FC levels?

  1. Back To Top    #1

    Join Date
    Jun 2014

    How to test high FC levels?

    I am getting ready to do my first SLAM but my test kit only measures up to 5 on FC. I'm going to need to get around 24 for shock value, so can I use my kit to read that high? For example can I fill the sample halfway and just double my reading, a third and triple, etc.? Or does it not work like that and I need to get a better kit?

    Thanks in advance.

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: How to test high FC levels?

    Welcome to TFP!

    It is possible to get some very rough approximations with that kit, +-5 at best, but it much easier and more efficient if you get a FAS-DPD chlorine test, which can measure up to 50 in steps of 0.5.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3
    Casey's Avatar
    Join Date
    Apr 2007
    SW PA

    Re: How to test high FC levels?

    You need a TF100 or a K2006 test kit which can read FC levels up to 50ppm.

    You can look at them here Test Kit Comparison

    We recommend the TF100 because it's a better value for the money.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

  4. Back To Top    #4
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: How to test high FC levels?


    What test kit are you using?

    If you have the popular K-2005 tester, you can just add the FAS-DPD test and have everything you need.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
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