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Thread: Should CYA be stable or can it vary?

  1. Back To Top    #1

    Join Date
    Jul 2012
    Chandler, Arizona

    Should CYA be stable or can it vary?

    The CYA level in my pool has been 70-80 for a long time and I've not had to add any Cyanuric acid. I just got back from a business trip and tested the pool for the first time in 4 weeks. Surprisingly, everything was still pretty good (pH a little high, but SWG kept chlorine good) except CYA had dropped to 55!
    Should CYA be pretty stable, or this type of drop normal?
    12,000gal Venetian glass tile. 4 Pentair Whisperflow (2x1HP, 2x1.5Hp), 1xPentair Waterfall pump (1HP), Triton II sand filter, MiniMax NT 400 heater, PC2000 in floor cleaner, Resilience A5 SWG, pHtek automated acid system, Paramount Clear O3 Ozne Generator.

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

    Re: Should CYA be stable or can it vary?

    It's not uncommon for CYA to drop over the season. Have you had a lot of overflow? If so, that would explain it.
    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
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