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Thread: Tonight's numbers and another question

  1. Back To Top    #1

    Join Date
    Jun 2007
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    Tonight's numbers and another question

    I just tested
    FC bright yellow above the .5
    PH 7.2
    cya 40
    TA 110
    TC 12.5 I think I did the drop test 25X.5, did the CC test water stayed clear so no CC. If I'm correct my tc is 12.5 right?

    Not sure if I have enough in my kit to do another full drop test. I have to reorder some tomorrow.

    How often should I check CYA? Trying to figure out if I need a refill on that also. I have enough for 1 more test.

    I'll update my number again in the am
    Cheryl
    14X42 Intex Ultra Frame

  2. Back To Top    #2

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    Re: Tonight's numbers and another question

    I'm not familiar with the chlorine test that you described so I'll let someone else answer that one.

    Once your CYA is in range, you can typically check it monthly. Check it more often if you have had lots of water changed out or anything.

  3. Back To Top    #3
    JasonLion's Avatar
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    Re: Tonight's numbers and another question

    You normally only need to test CYA two or three times a season, plus after you add CYA, or when there has been a significant amount of water replacement.

    I think you mixed up TC and FC. The simple OTO chlorine test, where drops turn the sample various shades of yellow, measures TC. While the more complex FAS-DPD chlorine test, where powder turns the sample pink and then drops eventually turn it clear again, measures FC and CC.

    In any case, yes it sounds like your FC level is 12.5 and CC is zero.
    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

  4. Back To Top    #4

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    Re: Tonight's numbers and another question

    I get very confused with the different chlorine tests. How low do I need to get my FC down to before the kids can swim?
    Cheryl
    14X42 Intex Ultra Frame

  5. Back To Top    #5
    JasonLion's Avatar
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    Re: Tonight's numbers and another question

    You are good to swim right now. You can swim when FC is at or above the minimum and below shock level. With CYA at 40 that is between 3 and 15.
    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

  6. Back To Top    #6

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    Re: Tonight's numbers and another question

    kids will be happy to hear that, my water is clear now too guess all that extra bleach gave it a good cleaning.
    Cheryl
    14X42 Intex Ultra Frame

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