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Thread: Lost my CYA

  1. Back To Top    #1

    Join Date
    Mar 2009
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    Woods of North Florida
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    Lost my CYA

    I couldn't figure out why I was using so much liquid chlorine (put in 2 jugs of 2 1/2 gallon 10 percent before I went out of town for 2 days) until I tested my CYA (which was around 50) and now it is 0. FC was also 0 but that's no surprise with fun sun, 90 degree temperatures, and 0 CYA.

    Is there something out there that eats CYA? I have not had this problem in the past and searching the forum I couldn't find anything similar. I have not backwashed that much. Instead I have had to add water due to evaporation (I don't think it is ever going to rain again at my house) and a leak we had to fix.

    I'm off to buy more CYA and chlorine. I'd appreciate any thoughts! Thanks!
    24' Seaspray Evolution CLX Above Ground Pool (~13600 gallons)
    Pentair Sand Dollar SD60 / 22.5" filter / Maximum Flow Rate 60 GPM
    Pentair Dynamo Pump 1 1/2 HP

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    Mod Squad Bama Rambler's Avatar
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    Re: Lost my CYA

    There have been reports of CYA going to zero. Most of the times it's happened over the winter but Richard (Chem Geek) had it happen to him.

    How are you testing for 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
    Pool School ----- Pool Math ----- TF-Test Kit

  3. Back To Top    #3

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    Re: Lost my CYA

    Thanks for the reply!

    I have the TF-100 test kit. I had to buy extra R-0013 last year and the lid to the large bottle has broken. Could that make it go bad so the test isn't accurate?

    I already added liquid CYA earlier this year, then added another big bottle of granules. I had a pretty good leak and lost a lot of water so I wasn't surprised to have to add so much at the begining of the season. I am shocked to see it all gone now, though.

    I know I have been fighting algae. My pool looks clear, but there is algae under my wedding cake steps (I have three sets in the pool) so I have been trying to swish under them and keep the chlorine level up high.

    I appreciate any help I can get!
    24' Seaspray Evolution CLX Above Ground Pool (~13600 gallons)
    Pentair Sand Dollar SD60 / 22.5" filter / Maximum Flow Rate 60 GPM
    Pentair Dynamo Pump 1 1/2 HP

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    Mod Squad Bama Rambler's Avatar
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    Re: Lost my CYA

    Can you detect FC after an hour of adding chlorine to the pool?
    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

  5. Back To Top    #5

    Join Date
    Mar 2009
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    Woods of North Florida
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    Re: Lost my CYA

    Ran out and checked. I am now sitting at 22 FC.
    24' Seaspray Evolution CLX Above Ground Pool (~13600 gallons)
    Pentair Sand Dollar SD60 / 22.5" filter / Maximum Flow Rate 60 GPM
    Pentair Dynamo Pump 1 1/2 HP

  6. Back To Top    #6
    JasonLion's Avatar
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    Re: Lost my CYA

    You should start adding more CYA. CYA shouldn't disappear as long as you maintain an FC level. Or to put that another way, CYA should only disappear when FC is zero.
    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

  7. Back To Top    #7
    Mod Squad Bama Rambler's Avatar
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    Re: Lost my CYA

    What he said ^ !
    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

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    surfhawaii's Avatar
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    May 2011
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    Re: Lost my CYA

    Ok, need some more education. I thought you said the only way to get rid of CYA was to drain the pool.
    24.5k gallon
    Sand filter (Triton II TR 100)
    IG tile
    Pentair VS+SVRS pump
    Sundance Chelsee spa

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    Mod Squad Bama Rambler's Avatar
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    Re: Lost my CYA

    The only reliable way to get rid of CYA is to drain or R/O. There are a few reports of some type bacteria converting the CYA into ammonia and leaving no CYA in the water. We don't understand enough about it to replicate it or even know if we could or should try to.
    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

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