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Thread: CYA Mystery

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    Join Date
    Jun 2008
    Avon Park, FL

    CYA Mystery

    About a month ago, I had water tested at Pinch A Penny and they said my CYA was around 90 or a little higher. I took out the tablets and haven't used them since. I had an algae problem a few weeks ago and got it cleared. I also recently purchased a SWG and got my new TFTest Kit in today. When I took the sample for CYA, the black dot never disappeared which means the CYA is low. How could it have dropped so low already. I know I did the test right.
    15200 Gallon, Vinyl, Cartridge Filter 100 GPM, SWG

  2. Back To Top    #2
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: CYA Mystery

    Since you know you did the test right it's really low.
    We've been having several posters with CYA mysteriously going to zero this year.
    We know that there is a bacteria that converts CYA into Ammonia but we don't fully understand the particular instances when this happens. A leak with a lot of refill will also drive the CYA down a lot. This is most common with an autofill where it adds water without the owner realizing it.

    That and Pool Store CYA tests are notoriously inaccurate.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  3. Back To Top    #3

    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: CYA Mystery

    That and Pool Store CYA tests are notoriously inaccurate.
    That's my bet.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  4. Back To Top    #4

    Join Date
    Mar 2007
    Coastalish 'down easter'

    Re: CYA Mystery

    Quote Originally Posted by duraleigh
    That and Pool Store CYA tests are notoriously inaccurate.
    That's my bet.
    And the cl test, the pH test, the alkalinity test, and the calcium test!
    Luv& Luk

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

  5. Back To Top    #5

    Re: CYA Mystery

    Pool Store...tests are notoriously inaccurate.
    WAIT! Let's be fair here...

    Pool stores can be EXTREMELY accurate!

    Just call them and ask for a price on something.
    17k in-ground, Pebble Sheen finish (Blue Granite), Solar, two skimmers, split drain.
    IntelliPro VS-3050, IntelliChlor IC40, EasyTouch 4 control system, Easy Touch wired indoor panel.
    300 CuFt cartridge filter. Polaris 380 with booster pump. Two IntelliBrite 5G lights.
    TF100 test kit.

  6. Back To Top    #6

    Re: CYA Mystery

    LOL..good one Folsom!!!

    I actually (for kicks) brought a water sample to my local pool store the other day and - just as this post suggested - the CYA level they gave me was VERY wrong. I've been consistently getting a reading between 50-60 and they actually told me it was 30.
    20'6" X 38'6" (609 sqft)
    22,500 gal gunite/plaster IGP
    DE filter, Jandy 2HP pump, Nature2 Sanitizer (removed cartridge!)
    Raypak 39.9K BTU gas heater
    2 ColorLogic lights, Polaris 360 pool cleaner

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