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Thread: Pool store test vs TF-100 why differenent for CH

  1. Back To Top    #1

    Join Date
    Aug 2008
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    Salida, Ca
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    Pool store test vs TF-100 why differenent for CH

    Pool is fairly new, Water Clear

    readings:
    FC 3 Pool Store 3
    CC 0.0
    TC 3
    PH 7.8 Pool Store 7.8
    T/A 140 Pool Store 120
    CH 390 Pool Store 190
    CYA 80 Pool Store 100
    Salt 3680 Pool Store 3800
    Temp 81

    after test added 42oz 34% MA

    Why would there testing differ?
    I did notice that they do not cap there reagents they sit in a box with lids off all day?
    14K Gal, IG, Plaster 3M Splash, 450 Sq ft. System 3 Cartridge, IntelliPro VS3050 Pump
    IntelliChlor IC40 SWG, 1 Skimmer, 3 Eyeballs
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    296 sq. ft. Solar Panels 2nd Story
    TF-100 test kit
    Filled for first time 6/28/08

  2. Back To Top    #2
    JasonLion's Avatar
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    Re: Pool store test vs TF-100 why differenent for CH

    Pool store tests are often surprisingly unreliable. You are actually doing really well, because all the numbers are within the error of the test except CH. Many pool stores are much worse than that.

    The CH and CYA tests can be particularly problematic because it takes some time to do them correctly. Pool stores don't generally want to take that much time, so they rush the test and get incorrect results.

    I would trust your test results over the pool store.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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  3. Back To Top    #3
    TizMe's Avatar
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    Re: Pool store test vs TF-100 why differenent for CH

    They leave the caps off because if your doing test after test after test its a pain to put on take off all the time. For your CYA level your min FC level should be 6 and your target FC level should be 9 so you need to raise that some.

    House keeping note: Please add your pool info to your to help us help you.
    Les
    Don't have a pool right now. Just sharing what I have learned over the years!
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  4. Back To Top    #4
    Butterfly's Avatar
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    Re: Pool store test vs TF-100 why differenent for CH

    Hi blebob and welcome to the forum

    You did a very nice job on your sig! And, as Jason said, always trust your numbers over a pool store.

    Quote Originally Posted by TizMe
    For your CYA level your min FC level should be 6 and your target FC level should be 9 so you need to raise that some.
    Tiz, he has a SWG and his recommended FC levels are 3 to 5.
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  5. Back To Top    #5
    TizMe's Avatar
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    Re: Pool store test vs TF-100 why differenent for CH

    Ooops !! I missed that .... sorry !
    Les
    Don't have a pool right now. Just sharing what I have learned over the years!
    Helpful Links:
    Pool School,Pool Calculator,Cl/CYA Shock Chart,TF Test Kit
    Doing BBB and loving it!

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