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Thread: CYA has dropped, now I can put it where I want it...but where?

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    FlyAU98's Avatar
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    Question CYA has dropped, now I can put it where I want it...but where?

    So where do I want it?

    After taking over from the pool guy (9 months ago?) my CYA tested at 25 today...

    South Florida Pool, solar heated, and we keep it in the upper 80s as much as possible (solar controller is set just under 90 degrees).

    My chlorine use has noticeably increased over the past month or so...

    So now I have the opportunity to take the CYA to where it would best suit my pool. I was thinking around 40?

    Chlorine is all done via liquid, with a few short exceptions when I go out of town for more than a few days (usually a 5-7 day trip), when I've been using unknown tablets my dad had left over (my calcium number rose about 25ppm over the past couple months, with about 10-11 days of tablet use).

    I don't have a preference in methods to raise the CYA, and my pool store is having a 20% off anything/everything sale this weekend, so its a good time to buy (along with 50% off liquid chlorine!). All things being equal, I might prefer to use tablets to chlorinate and raise CYA if that would work for me.

    Today's TF-100 test:
    pH=7.5
    FC=5
    CC=0
    TC=5
    CH=300 (up from a very steady 275 for months)
    TA=70 (I added about 30oz of baking soda to bring this up to 80, I haven't re-tested though)
    CYA=25
    15.5K gal, concrete, 1HP AO Smith pump, Hayward C1200 cartridge filter, Zodiac T5 Duo auto cleaner, 8 panel solar heater controlled by Hayward Aqua Solar GL-235

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    duraleigh's Avatar
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    Re: CYA has dropped, now I can put it where I want it...but where?

    In your climate, I would suggest 50 ppm CYA.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    FlyAU98's Avatar
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    Re: CYA has dropped, now I can put it where I want it...but where?

    Quote Originally Posted by duraleigh View Post
    In your climate, I would suggest 50 ppm CYA.
    How do you recommend I bring it up the 25ppm to get to 50ppm?

    I only have a couple of the unidentified tablets left... So whatever way the brain-trust here suggests will be bought at the pool store on Saturday or Sunday...

    If tablets is the answer...which ones do I buy to not mess anything else up along way?
    15.5K gal, concrete, 1HP AO Smith pump, Hayward C1200 cartridge filter, Zodiac T5 Duo auto cleaner, 8 panel solar heater controlled by Hayward Aqua Solar GL-235

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    JasonLion's Avatar
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    Re: CYA has dropped, now I can put it where I want it...but where?

    I would use granular stabilizer/cyanuric acid to raise CYA. It will get you to a good level way more quickly and is simple to use (if you don't fuss over it).
    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

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    Divin Dave's Avatar
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    Re: CYA has dropped, now I can put it where I want it...but where?

    I agree with Jason. Granualr is the way to go to make that large of an increase. Walmart has 4 lb jugs for about 15 dollars a jug.
    For your size pool, it would take right at 4 lbs to get your CYA to 50.

    Here is a couple of useful links for you.
    http://www.troublefreepool.com/conte...mmended-levels
    http://www.troublefreepool.com/conte...art-slam-shock
    http://www.troublefreepool.com/calc.html
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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