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Thread: CYA test

  1. Back To Top    #1

    Join Date
    Jul 2009
    Location
    New Jersey
    Posts
    29

    CYA test

    I just got my TF100 and my CYA levels are weird. Monday I tested with a Leslie pools DPD kit and it showed 110. Thursday I tested the TF100 kit showed 100(after I replaced 1/3 the water. I re-tested and it showed 90. I went to Leslie pool supply(OMG, they are (fill in the blank) and they said it was 45. Yesterday I tested and it was 90 so I went to Leslie's again (painful to be in there) and they told me it was 28, and I should add stabilizer. Today I tested and it was 70(about what I thought it should be after that water replacement)
    Are the people at Leslie's or any other pool store just that incompetent or deceitful?? Does it take time for CYA to read lower after water replacement? Does it take some practice getting the readings right? When should I trust my testing?

    Also, they said my Phosphates were 300 on Thursday and 800 on Saturday(they tried to sell me a $30 quart of Phos-free and said that Algae live on phosphates.

    BTW.....Water is Crystal clear!
    Other numbers are:
    FC-7.5
    CC-0
    TC-7.5
    PH-7.2
    TA-80
    CH-160
    CYA-70
    Temp-80
    22.000 Inground Vinyl-2 years old
    Hayward EC75 DE Filter
    1 1/2 Superpump
    CL200 Chlorinator

  2. Back To Top    #2

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    duraleigh's Avatar
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    Apr 2007
    Location
    Sebring, Florida
    Posts
    28,394

    Re: CYA test

    Are the people at Leslie's or any other pool store just that incompetent or deceitful?? No, they use poor methods and are frequently incompetent but I don't believe they are deceitful. (usually)

    Does it take time for CYA to read lower after water replacement? No.

    Does it take some practice getting the readings right? Yes. Being precise isn't absoloutely necessary. plus or minus 10 is the test accuracy and you'll vary from that a little when your new with the test.

    When should I trust my testing? Right now. Your drops-based results are virtually always better than any other source.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3
    PVille's Avatar
    Join Date
    May 2009
    Location
    Purcellville,VA
    Posts
    39

    Re: CYA test

    I stopped using the pool store results two years ago. They were never as careful as I was when performing the tests and our results never matched. I use my Taylor test kit and only use my results and things are fine.

    I found this article on CYA testing from the Taylor web site useful.

    http://www.taylortechnologies.com/Chemi ... ntentID=44
    In ground 15 X 33 10,400 gal. Fiberglass
    Two Returns, Two main drains, One skimmer
    Aqua Logic SWG, Hayward TriStar 1.5HP
    Hayward C3025 (325 sq /ft) Cartirdge Filter
    Solar Heater (Details at http://www.bakerlabs.com/solar)

  4. Back To Top    #4

    Join Date
    Jan 2009
    Location
    Cupertino, CA
    Posts
    1,966

    Re: CYA test

    Quote Originally Posted by duraleigh
    Does it take time for CYA to read lower after water replacement? No.
    Well, you need to give the fresh water time to mix in with what was left in the pool, but I figure 1/2 hour with the pump running will take care of that. (Picky, picky.)

    Aside from that, ditto to everything duraleigh said.
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

  5. Back To Top    #5
    Butterfly's Avatar
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    May 2007
    Location
    South Carolina
    Posts
    10,045

    Re: CYA test

    BTW, TRazzNJ , your numbers look great

    Ditto on the "always trust your own testing".
    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.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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