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Thread: Help with my numbers

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    Help with my numbers

    Hello - I have a 8200 above ground vinyl pool. We started the BBB method last year, mid-year. The cover came off today and the water looked marvelous - crystal clear - first year since ever that it has looked that good upon removing the cover )

    My TF-100 kit came last week and I was able to use it for the first time today. Here are my numbers:

    FC - 2.5 - going to push that up to 5 ppm
    CC - 0
    TC - 2.3
    pH - 7.2
    T/A - 120
    CH - 270
    CYA - 40

    Shouldn't I shock by taking levels up to about 10 ppm - then letting it go to 5? I have a fountain and have found that the pH gets plenty high by running that, so should I hold out on the washing soda or borax?

    In the past our CYA was over 100, or so the pool store would report to me. Over last summer, we let out some water and then did again at closing, so it is either better or was never as high as the store reported to me.

    One thing I may have that the kit doesn't seem to measure is copper. Can I purchase chemicals to test for copper? I had a high reading last year due to too much algaecide added at closing the year before - I did add a bit at closing last year but was more careful.

    Thanks in advance for looking over my numbers and suggestions. I feel like I am beginning to know what I am doing this year. The BBB method is wonderful and only wish I had known of it earlier.
    Splash Pool - above ground - 13X21X4 - location - Kansas - 8200 gal. - sand filter -

  2. Back To Top    #2
    Butterfly's Avatar
    Join Date
    May 2007
    Location
    South Carolina
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    10,045

    Re: Help with my numbers

    Quote Originally Posted by hsmom
    Hello - I have a 8200 above ground vinyl pool. We started the BBB method last year, mid-year. The cover came off today and the water looked marvelous - crystal clear - first year since ever that it has looked that good upon removing the cover )
    Congratulations! Felt good, huh.

    My TF-100 kit came last week and I was able to use it for the first time today. Here are my numbers:

    FC - 2.5 - going to push that up to 5 ppm
    CC - 0
    TC - 2.3
    pH - 7.2
    T/A - 120
    CH - 270
    CYA - 40
    Okay, I think your TC of 2.3 is just a typo.

    Shouldn't I shock by taking levels up to about 10 ppm - then letting it go to 5?
    You can do an overnight test to see if you need to shock. If you should need to shock, the shock level for 40 CYA is about 15, not 10. See the Chlorine/CYA chart in my sig.
    But, you do need to at least maintain your FC between 3 & 6.

    I have a fountain and have found that the pH gets plenty high by running that, so should I hold out on the washing soda or borax?
    Your pH & TA are fine. No need to add anything for them.

    In the past our CYA was over 100, or so the pool store would report to me. Over last summer, we let out some water and then did again at closing, so it is either better or was never as high as the store reported to me.

    One thing I may have that the kit doesn't seem to measure is copper. Can I purchase chemicals to test for copper? I had a high reading last year due to too much algaecide added at closing the year before - I did add a bit at closing last year but was more careful. See if your pool store will test that for you.

    Thanks in advance for looking over my numbers and suggestions. I feel like I am beginning to know what I am doing this year. The BBB method is wonderful and only wish I had known of it earlier.
    Keep up the good work
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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    JasonLion's Avatar
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    May 2007
    Location
    Silver Spring, MD
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    37,887

    Re: Help with my numbers

    There is no need to shock as long as the water is clear.

    You can get a copper test kit, the Taylor K-1738, but it costs around $50.
    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

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