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Thread: High cya, need options

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    High cya, need options

    50k inground, vinyl liner, new 300lb sand filter,years of tri and dichlor treatment.Just got my Taylor k-2006 FAS-DPD kit and stockpiled 10% bleach. CYA readings concern me. Is there hope beyond draining? pH 6.8
    TA 95
    Cya 180
    FC 1
    TC 1
    CH 75
    Should I balance pH and test again, or is that a pipe dream? I have dumped 50 lbs of dichlor with no change in FC, based on previous owner recommendation testing with strips. Water is very close to clear.
    45,000 gallon in-ground large T, vinyl liner, Jacuzzi 1.5 hp magnum pump, Hayward 24" 300lb sand filter.

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    frustratedpoolmom's Avatar
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    Re: High cya, need options

    Do you understand how much CYA you added with 50 lbs of Dichlor, which contains CYA?

    - - - Updated - - -

    No, no point in adjusting PH when you'll need to drain and replace water. Sorry

    - - - Updated - - -

    What are you testing with?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: High cya, need options

    And...if pH gets right, will it be safe to swim?

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    frustratedpoolmom's Avatar
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    Re: High cya, need options

    How is the PH going to "get right"?
    PH that is off is uncomfortable and can be irritating but it won't harm you. I'd be more concerned about swimming in an unsanitary pool with inadequate chlorine...That can be risky to say the least.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: High cya, need options

    Thank you for your response. Much as I thought. Painful lesson.

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    frustratedpoolmom's Avatar
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    Re: High cya, need options

    Quote Originally Posted by UMREBL View Post
    Thank you for your response. Much as I thought. Painful lesson.
    I'm sorry...
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Mod Squad pooldv's Avatar
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    Re: High cya, need options

    50lbs of dichlor added 74 ppm of chlorine and 67 ppm of CYA to your 45k gal pool. With CYA at 180 your target chlorine level is 21 ppm and your shock level is 69 ppm. Chlorine CYA Chart It is really unmanageable. When partially draining a vinyl liner pool it is very important to leave a foot of water in the shallow end. You need to get the CYA down to 60 or 80 at the most.
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    Re: High cya, need options

    I have 40lbs of soda ash and 40 Gallons of 10% bleach. Just wondering if it may stabilize at 17 ppm FC and make it through summer

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    I guess it's time for that new liner, and new water to! Thanks for confirming my suspicions.

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    frustratedpoolmom's Avatar
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    Re: High cya, need options

    That will raise your PH to about 7.0 which is still too low.

    Do you understand that chlorine has to be added EVERY DAY? So one gallon will give you roughly 2ppm, which is on the low end of the typical loss a pool owner sees. In a "normal" pool situation, that may be ok, but with an overstabilized pool it's risky at best. On top of that, you'll still have to reach your minimum FC level first - and ensure that it's holding overnight - but you're guessing on what that actually is, because the dilution method to determine the CYA level loses accuracy...

    I'm not going to beat around the bush... you need to do a drain and refill.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Isaac-1's Avatar
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    Re: High cya, need options

    Why would you need to replace the liner unless it has been damaged, just do a series of partial drain and refill cycles until your CYA level is down where it should be.
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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