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Thread: Is a CYA of 25 ok?

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    Join Date
    Apr 2010
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    Syracuse, NY
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    103

    Is a CYA of 25 ok?

    Last year we suffered with too much CYA in our pool. This year it has been much better, and the water has been crystal all year. I just checked the CYA level and it has slipped below 30, to about 25. Is this ok? Why is the recommended level between 30-50? I have some stabilizer I can add if necessary. Thanks.
    20,000 gal., Jacuzzi 250L Laser Sand Filter, inground w/vinyl liner, 1hp pump motor, TF-100 Test Kit.

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    linen's Avatar
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    Jul 2010
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    Twin Cities, MN
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    Re: Is a CYA of 25 ok?

    Where do you live?
    Are you having a hard time keeping your FC level above the normal minimum for your pool and CYA level during the day or do you have to overdose FC above the normal maximum for your pool to maintain its normal minimum?
    How are you testing?

    If it is working for you, I am not sure I would add any. By working I mean, no algae outbreaks, need for preemptive shocking this year, no needing to add chlorine multiple times a day? You can post full test results if you want.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Is a CYA of 25 ok?

    Any plans for a vacation in the near future? If so, you might want to wait until then to do anything. You would have the luxury of using trichlor pucks in a floater or automatic chlorinator for at least part of the time you were away.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    frogabog's Avatar
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    Jul 2010
    Location
    Portland, Oregon
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    Re: Is a CYA of 25 ok?

    I agree. If it's working for you, more power to ya. I ran at 25 last year without any issue. It was nice because it equaled out to 1 cup of bleach per ppm. This year at 40ppm CYA I have to add 2-3 oz to every cup to make 1ppm (depending on water level).
    Where kids swim in 54 degree water, turn blue, and giggle happily cuz they got a POOL!
    Year 3 BBB -15' x 48" Intex Metal Frame - Was using (2) 1000gph Intex cartridge filters (see Full time pumping Intex). 2012, converted to 1600gph and sand filter+SWG = Sand filter love affair!
    Don't waste time and energy looking for a better value on test kits, the TF100 is the best deal around. I did the looking and spent the extra money, but you don't have to make the same mistake. Just go here: TFTestkits. I use Pool Calculator for min/max, and shocking chlorine levels.

  5. Back To Top    #5

    Join Date
    Apr 2010
    Location
    Syracuse, NY
    Posts
    103

    Re: Is a CYA of 25 ok?

    Thanks for the feedback. So I guess if it works, don't fix it. The water has been beautiful all year, and there is only a couple of weeks left in the swimming season here anyway. And yes, it is a good opportunity to use up a few of the pucks.
    20,000 gal., Jacuzzi 250L Laser Sand Filter, inground w/vinyl liner, 1hp pump motor, TF-100 Test Kit.

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