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Thread: CYA at 0

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    Join Date
    Jan 2013
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    Miami, FL
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    CYA at 0

    I just tested my CYA and it tested at zero. The test was not cloudy at all. I've searched the posts on this site and have seen the threads about the anaerobic bacteria that converts CYA to ammonia.

    I broke a line a few months back and had muddy water pumping into the pool for a couple of minutes so it is quite possible the bacteria was introduced to my pool.

    I last tested the CYA in April and it was at 42. haven 't tested since.

    The only thing that puzzles me is that my pump has been running 12 hours a day for the whole time. So it is not like many of the posts I see where thus bacteria shows up after the pool has been closed for the winter.

    I am going to the pool store to have the double check my test before I do anything...
    11k Gallon, Catridge Filter, In Ground Marcite, 1.5 HP Pump, (Unsure of filter Flow Rate)

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    Mod Squad Bama Rambler's Avatar
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    Re: CYA at 0

    Which CYA reagent do you have?

    In all the instances I can remember, we have had one instance where a perfectly clear pool had the CYA convert, so it's very rare to have it happen, but it can happen. It's a good idea to have it verified in this case, but I wouldn't put much faith in the actual number. In fact, I'd probably take it to a couple of stores just to be sure.
    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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    Butterfly's Avatar
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    Re: CYA at 0

    Post your test results for us. We'd like to see it:

    FC
    CC
    pH
    TA
    CH
    CYA - zero
    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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  4. Back To Top    #4

    Join Date
    Jan 2013
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    Miami, FL
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    Re: CYA at 0

    FC 17.5
    CC 0
    TA 110
    CH 250
    CYA 0

    Did not test PH as the Chlorine was so high. The FC level had dropped to 0 so I was going to SLAM the pool. I Added chlorine last night which is why FC is so high but forgot about the CYA test until this morning.

    I use the TF-100
    11k Gallon, Catridge Filter, In Ground Marcite, 1.5 HP Pump, (Unsure of filter Flow Rate)

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    Butterfly's Avatar
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    May 2007
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    South Carolina
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    Re: CYA at 0

    If you haven't tested since April, having gone all summer, the CYA could be below 20 and would not register on the test.

    I suggest you add about 30 CYA via sock method and complete the SLAM process.
    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. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  6. Back To Top    #6

    Join Date
    Jun 2012
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    Louisville, KY
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    Re: CYA at 0

    A leak could cause this as well as the CYA would go with the water and over that long of a period (haven't tested since April) you could have very low CYA. I'd suggest a bucket test to make sure.
    18x36 inground vinyl lined, Hayward sand filter and tablet chrolinator, approx 18k gallon

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