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Thread: CYA dropped?

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    Join Date
    Jun 2016
    Location
    Ithaca, New York
    Posts
    50

    CYA dropped?

    Hi all,

    Today when we tested the pool, the CYA was 48. It had been at 80, right where it should have been. Why would it have dropped? PoolMath says to add stabilizer, is that correct? Will that change other results?

    FC 7
    CC 0
    pH 7.8
    TA 200 (I know this is high)
    CYA 48
    Intex round pool, 18' x 48"
    Cartridge filter, 1500 gph
    SWG
    Well water
    Full sun

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    Mod Squad tim5055's Avatar
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    May 2014
    Location
    Columbia, SC
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    Re: CYA dropped?

    How are you testing that you got 48 as your CYA level?
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

  3. Back To Top    #3

    Join Date
    Jun 2016
    Location
    Ithaca, New York
    Posts
    50

    Re: CYA dropped?

    With the Taylor test kit - the disappearing dot - rounding up it should be 50.
    Intex round pool, 18' x 48"
    Cartridge filter, 1500 gph
    SWG
    Well water
    Full sun

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    Mod Squad tim5055's Avatar
    Join Date
    May 2014
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    Columbia, SC
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    Re: CYA dropped?

    Quote Originally Posted by Lrinaldo99 View Post
    With the Taylor test kit - the disappearing dot - rounding up it should be 50.
    OK, now,we are on the same page. There is no 48, round to 50.

    Have we replaced a lot of water? Heavy rains? Pool party?

    Other than very minute amounts, the only way CYA goes down is with water leaving the pool.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

  5. Back To Top    #5

    Join Date
    Jun 2016
    Location
    Ithaca, New York
    Posts
    50

    Re: CYA dropped?

    Ok. We have a slow leak. Yesterday I turned on the hose to add water and forgot about it, so I added more than I intended. Perhaps that is the culprit? If that is the case then should I still use the stabilizer?
    Intex round pool, 18' x 48"
    Cartridge filter, 1500 gph
    SWG
    Well water
    Full sun

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