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Thread: Closing a pool with high CH & CYA

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    muzer66's Avatar
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    Closing a pool with high CH & CYA

    A first-time pool owner here in Atlanta, GA with a closing question:

    A few rookie mistakes...like shocking the pool once-a-week with dichlor & trusting the "free water testing" and "advice" from a chain pool store...has got our pool to this state, according to my K-2006 test kit:

    FC 10
    CC 0.4
    pH 7.4
    TA 110
    CH 475
    CYA 125


    I now know, because of this website, that a pair of 50% drain-&-refills are in our pool's future to get the CH and CYA levels down to more realistic levels. Pool closing is scheduled for mid-October. Should I do the drain-&-refills now, or wait until I open the pool next year ?
    12,5K gal. IG plaster ||| Jandy CL460 cartridge filter ||| Hayward 2HP Super Pump ||| unknown pool age…installed in the late-80’s ?? ||| K-2006C FAS-DPD kit ||| Polaris 360 pressure-fed cleaning bot

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    Smykowski's Avatar
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    Re: Closing a pool with high CH & CYA

    Welcome to the forum!

    First, how does the water look? How much water do you typically drain for closing? My gut reaction would be to do one drain and refill now, then let the closing process take care of the rest.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    muzer66's Avatar
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    Re: Closing a pool with high CH & CYA

    Thank You !! I'm so glad I've found TFP. I've learned so much !!

    Right now, our water is crystal-clear. We are newbies at this, so we have "farmed-out" the opening & closings so far and have no real idea as to how much water we've had to drain to close. I remember that when the pool was opened, we didn't have to add that much water...maybe 30-40 minutes worth straight from our garden hose.

    Where we live in Atlanta (DeKalb County), we need to contact the water department to obtain a "hydrant meter" in order to fill the pool. Sewage rates are tied to water usage here, so by using a hydrant meter, we avoid getting hit with a massive sewage bill for using ~9,000 gallons of water in one month. So if we do one 50% drain-&-refill now, that has to be coordinated with the water department before pool is closed in mid-October.

    I was just wondering...chemically-speaking...if it was OK to close our pool, especially with our high CH level just sitting there for 6-months. In a perfect world, I'd like to do this when we open the pool in 2015:

    *50% drain-&-refill
    *wait a week
    *do another 50% drain-&-refill
    *adjust CH & CYA accordingly
    12,5K gal. IG plaster ||| Jandy CL460 cartridge filter ||| Hayward 2HP Super Pump ||| unknown pool age…installed in the late-80’s ?? ||| K-2006C FAS-DPD kit ||| Polaris 360 pressure-fed cleaning bot

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    Re: Closing a pool with high CH & CYA

    If it were my pool, I would rather get it fixed now so I could begin to manage it properly.

    Your way will work but may 'cause some complications if you fall behind in the Spring.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Mod Squad tim5055's Avatar
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    Re: Closing a pool with high CH & CYA

    Quote Originally Posted by muzer66 View Post
    In a perfect world, I'd like to do this when we open the pool in 2015:

    *50% drain-&-refill
    *wait a week
    *do another 50% drain-&-refill
    *adjust CH & CYA accordingly
    I'm not understanding why wait a week between the first and second 50% drain/refill

    Quote Originally Posted by duraleigh View Post
    If it were my pool, I would rather get it fixed now so I could begin to manage it properly.

    Your way will work but may 'cause some complications if you fall behind in the Spring.
    Agreed. My personality would not allow it to sit that way until it was opened in the spring.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    muzer66's Avatar
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    Re: Closing a pool with high CH & CYA

    Thank You for all of the advice !! It looks like we'll do a 65% to 70% one-time drain to get our CH & CYA levels in-line for closing the pool. Now I just have to figure out where to put ~10,000 gallons of water into our small, suburban yard.
    12,5K gal. IG plaster ||| Jandy CL460 cartridge filter ||| Hayward 2HP Super Pump ||| unknown pool age…installed in the late-80’s ?? ||| K-2006C FAS-DPD kit ||| Polaris 360 pressure-fed cleaning bot

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