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Thread: CYA High but not experiencing any problems

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    CYA High but not experiencing any problems

    Test results:

    8/17/2011
    FC: 4.0
    CC: 0
    PH: 7.6
    Alk: 70
    CH: 70
    CYA: 110
    Salt: 3000

    I'm not experiencing any issues and the water looks awesome but should I be concerned about the high CYA? It's been like that since about May and I was hoping through splash out and evaporation that it would go down but it's held at that all summer.
    1) 7500 Gallon Free Form Gunite Pool / 800 Gallon Gunite Spa
    2) EasyTouch 8 Automation / IC20 Intellichlor
    3) Intelliflo VS Pump for pool and water features - Cartridge and DE Filter / 2 Speed Pentair Pump for Spa and Cartridge Filter

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    duraleigh's Avatar
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    Re: CYA High but not experiencing any problems

    Yes, you should be concerned about it. You are operating your pool outside what we consider "safe" (algae free) guidelines but you already know that.

    You may get away with it the rest of the summer or you may not.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: CYA High but not experiencing any problems

    Splashout and excess rain will help. I don't think evaperation will. Be very careful not to use anything that will raise the cya. We get a lot of rain here so I would try to let it come down. Where do you live? Do you get a lot of rain? If not the only answer is partial drain and fill.
    10,800 gallons Gunite/Plaster
    Hayward 244t 24" Sand Filter with Zeo
    1 1/2 HP Challenger
    Digital Pool Pilot DIG-220 SC-48
    Located in NOLA

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    Re: CYA High but not experiencing any problems

    Quote Originally Posted by Dalandlord
    Splashout and excess rain will help. I don't think evaperation will. Be very careful not to use anything that will raise the cya. We get a lot of rain here so I would try to let it come down. Where do you live? Do you get a lot of rain? If not the only answer is partial drain and fill.
    I meant evaporation and then a top off of the pool which I've done a few times this year already. Live in Florida and the afternoon storms seem to keep the pool full most of the time.

    If my water didn't look so good and everything staying so stable I would make a change but I haven't had to add anythin to the pool. PH is stable, ALK is stable and FC never drops below 4.0.
    1) 7500 Gallon Free Form Gunite Pool / 800 Gallon Gunite Spa
    2) EasyTouch 8 Automation / IC20 Intellichlor
    3) Intelliflo VS Pump for pool and water features - Cartridge and DE Filter / 2 Speed Pentair Pump for Spa and Cartridge Filter

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    Mod Squad Bama Rambler's Avatar
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    Re: CYA High but not experiencing any problems

    What happens with evaporation is that as the water evaporates, the concentrations actually get higher, and when you refill, they go back to where they were before the evaporation. So evaporation and refilling doesn't gain you anything.
    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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    Re: CYA High but not experiencing any problems

    Quote Originally Posted by Bama Rambler
    What happens with evaporation is that as the water evaporates, the concentrations actually get higher, and when you refill, they go back to where they were before the evaporation. So evaporation and refilling doesn't gain you anything.

    Makes sense. If I can plan a day or two out and I know we are going to get rain, I'll do a good backwash to drain the pool some and then let mother nature fill it back up. Just by the posts on here, it seems like I should do something rather than do nothing.
    1) 7500 Gallon Free Form Gunite Pool / 800 Gallon Gunite Spa
    2) EasyTouch 8 Automation / IC20 Intellichlor
    3) Intelliflo VS Pump for pool and water features - Cartridge and DE Filter / 2 Speed Pentair Pump for Spa and Cartridge Filter

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    Richard320's Avatar
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    Re: CYA High but not experiencing any problems

    It can be done. I did it all last summer as we were under water restrictions. But it's not easy, and I don't reccomend it.

    For starters, you need to maintain a minimum of 8 FC. And that's at the end of a hot day with people swimming - so really you shouldn't let it slip below 10, which also means that when you add bleach, your target should be 12 or 13. And all that means you must use the FAS-DPD test every day, the color block won't do.

    Second, your pH tests will always be suspect, because you're reading it with FC>10. How far off? I don't know. I didn't have a choice, it was the only way to read pH!!

    My big break came when it started raining. I was able to divert a downspout to the pool, and capture about 3X as many inches of rain as the storm dropped. Until rains come, your best bet is to use pool water to water the lawn and any landscape plants. I haven't used it on the vegetable garden. Typically, you'll lose 2-3% every time you pump off a couple inches, so it will take a while to cut it in half.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    linen's Avatar
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    Re: CYA High but not experiencing any problems

    Quote Originally Posted by viberama
    I'm not experiencing any issues and the water looks awesome but should I be concerned about the high CYA?
    You have gotten some good advice already...my two cents... : It appears like you are on top of your testing and pool, i.e. you have good test numbers (what test kit are you using), and you know your "problem", therfore you are unlike many posters that come on here with problems . I am not sure where you live, but putting myself in your shoes (and then your shoes would be in Minnesota), we do not have much longer to swim , so I would wait, but keep a watchful eye out for problems (like it seems you have). My CYA level was lower when I opened this year than what it was when I closed last season (dropped from 80 to 50), so I would adjust next spring.
    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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    Mod Squad Bama Rambler's Avatar
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    Re: CYA High but not experiencing any problems

    I agree with Linen. At this point of the season I'd just be proactive and not too reactive. Keep every thing under control and plan for backwashing before a rain and it'll come down before long.
    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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