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Thread: CYA Problem

  1. Back To Top    #1

    Join Date
    May 2013
    Location
    Wisconsin
    Posts
    5

    CYA Problem

    Need some guidance folks,

    I purchased the TF test kit and can not get a CYA reading.

    Its not that it is too high, but I can see the black dot right up until the vile begins to overflow.
    I have some aquachek test strips I bought for just quick spot checks (I have nothing good to say about their indication) and although difficult to get a real reading, it looks generally low 30-50.

    I purchased some stabilizer to add from my local pool store and after some insistence from the owner that a pool as old as mine couldn't possibly have a reading that low, I brought in a water sample.

    They claim that the CYA reading they got is at "100" and I don't require any stabilizer to be added.

    I'm assuming that in the presence of a CYA value of 100 my water would be very milky looking after adding the reagent. This is not the case.

    My PH is a little high (~7.8), but I haven't read of any factors that could cause my reading to be so low.

    Am I missing anything here?
    I have done three tests now and several strips and all show low ratings.

    What should I do?
    Milwaukee WI, USA
    35K gal IG vinyl, 1.0 HP Haywood pump
    Sta-Rite Cristal-Flo T-240BP-1 Sand Filter
    Polaris 380

  2. Back To Top    #2
    elwood58's Avatar
    Join Date
    May 2012
    Location
    Sun City West Arizona (2nd Home)
    Posts
    639

    Re: CYA Problem

    You should trust your own readings more than the pool store. Add some CYA, but do it slowly. Give it 4-5 days to show on your test.
    19204 Gallon L Shape with a 10X10 2nd Step Baja Ledge. Intellichlor IC-40, IntellipH, Cartridge Filter, Pentair Heater/Chiller (Heat Pump). Tons of Deck with Deck Jets. Construction Complete 6/5/17.

    "If you don't measure it, you can't manage it!"

  3. Back To Top    #3
    linen's Avatar
    Join Date
    Jul 2010
    Location
    Twin Cities, MN
    Posts
    8,649

    Re: CYA Problem

    In addition to waiting a few day to test after adding, I would review the extended test kit directions for cya. In particular, make sure you are doing the test outside with the sun to your back and the vial held about at your waste looking down through it.

    I too would ignore the pool store and test strip results.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

  4. Back To Top    #4

    Join Date
    Jun 2012
    Location
    Louisville, KY
    Posts
    266

    Re: CYA Problem

    And make sure you are shaking the heck out of the CYA test. This is positively required to get the precipitate.
    18x36 inground vinyl lined, Hayward sand filter and tablet chrolinator, approx 18k gallon

  5. Back To Top    #5
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: CYA Problem

    Your test result is the expected behavior when CYA is zero, or near zero. That isn't particularly surprising if you just opened for the season as many people lose CYA over the winter.
    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

    Join Date
    May 2013
    Location
    Wisconsin
    Posts
    5

    Re: CYA Problem

    Thanks for the reassurance guys.

    I'll follow my original plan and slowly raise the stabilizer levels.

    Since, I'm in the process of opening the pool for the summer and currently running through the filter/backwash dance.
    Is there a recommended method to add powdered stabilizer at this time?

    I have read that typically you add it to a sock and let it dissolve in the skimmer.
    But in my case, wouldn't some/all of that be lost in the backwash stage?

    --Anthony
    Milwaukee WI, USA
    35K gal IG vinyl, 1.0 HP Haywood pump
    Sta-Rite Cristal-Flo T-240BP-1 Sand Filter
    Polaris 380

  7. Back To Top    #7

    Join Date
    Jun 2012
    Location
    Howell, NJ
    Posts
    977

    Re: CYA Problem

    We recommend adding it to a sock and tying it in front of a return. There was just recently a post with a picture of this method, that I will look for later (unless someone else finds it first).
    John
    7 year old ~13,500 gal 24' AGP with 1.5 hp Proline pump, 150 sqft Pleatco cartridge, filled with well water with pH of about 4.5.
    Wanda the Whale pool vacuum, home made heater, Taylor K-2006
    Cloudy Pool? 1) Order test kit. 2) Follow SLAM
    New to TFPC? Read Pool School a few times, then post questions. PoolMath will help with chemical additions.

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