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Thread: TA and CYA

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    billybrobob's Avatar
    Join Date
    Apr 2008
    Location
    NW Florida
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    TA and CYA

    Recent new member, my first post. I recently inhereted pool maintenace duties for my mother and I am grateful to the TFP forum for a quick learning curve. I have two questions that I haven't found directly addressed in the archive or stickies.

    (1) I have both Taylor 2005 and LaMotte Pro-7 colorimeter test kits. I like the Pro-7 for FC and PH. I like the Taylor for ALK and CH titrations, and it's nice to have a double check. Would TPFers place confidence in home tests or the PS's when test results disagree (assuming no bad chemicals or testing technique on the TPFer end). Does the PS have a superior test "lab"? There are three stores in my area, and they don't get the same results. Sometimes off as much 100% with CYA, CH and ALK using the same sample.

    (2) And secondly, to correct or not to correct TA for CYA? Taylor says yes, but notes that "some members of the pool/spa industry question its value." Not that important at high TA, but I am keeping my TA at 65 and my PH stays dead-on at 7.5/7.6 for weeks. I really like that. At a CYA of 45, is my TA of 65 really only about 50 ppm?

    FC 5.0
    CC .10 (little brats)
    PH 7.5
    TA 70
    CH 300
    CYA 45

    The forum here has made maintenance so understandable (and affordable), I feel like I'm overlooking something.
    40,000 gal pool, Goldline SWG, 1.5 hp pump, sand filter, plaster w/epoxy paint.

  2. Back To Top    #2
    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    37,879
    If you have a good test kit, which you do, always trust your own results over the pool store. The Taylor chemistry is really the gold standard of tests against which the others are compared. The ColorQ is wonderful at FC, CC, and PH as long as the FC and CH levels aren't too high. The big advantage of the fancy chemistry machines is that they can do the tests more quickly, but they are often less precise than the Taylor tests.

    Around here we always use TA as read directly from the test. Which one you want to use depends on what you are using it for. The only real use for adjusted TA is when calculating LSI or when comparing to a source that is listing adjusted numbers. But as I said everything at TFP and my Pool Calculator list/use the unadjusted number straight from the test.
    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
    billybrobob's Avatar
    Join Date
    Apr 2008
    Location
    NW Florida
    Posts
    31
    Thanks for the reply, I'll sleep better at night. Ditto to "Hooray for Jason Lion" and the TFP MVPs.
    40,000 gal pool, Goldline SWG, 1.5 hp pump, sand filter, plaster w/epoxy paint.

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