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Thread: Just shocking at night

  1. Back To Top    #1

    Join Date
    Jul 2011
    Location
    Perrysburg, OH
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    88

    Just shocking at night

    I'm wondering if just bringing pool up to shock levels at night will cause me any problems?

    Due to work, kids, their friends, and family in the pool daily, I've only been able to shock at night. FC levels drop back down to 5-7 by noon and then swimmers are in. I found out a couple weeks ago (after finding this site) that my CYA levels are low - maybe 15 (test is a little cloudy but still see the dot when tube is full). A couple weeks ago, pool was very cloudy, switching to bleach and shocking for a couple days made it crystal clear. Still haven't passed the overnight test and still get .5 CC daily. Typical test results below:

    FC 5
    CC .5
    TA 170
    CH 200
    CYA 15?
    PH 7.6

    Nothing way outta whack. The TA seems a little high and I know I need to add some CYA, but is there anything else of concern? Am I just wasting money adding extra bleach and not maintaining shock levels all day? Will I ever get CC to 0 and pass the overnight test this way?

    Like I said, water is now crystal clear and everyone loves it.... Hate to kick them out for a few days while shocking unless the weather gets bad.... Been sunny, hot here for two weeks - not sure if I can stay out for a couple days
    16 x 32 inground vinyl pool (21000 gallons) (new liner installed 2014)
    Hayward max flo pump w/ 1 HP AO Smith motor (new motor 2014)
    Hayward C1200 cartridge filter (new 2014)
    Hayward H150 heater

  2. Back To Top    #2
    dmanb2b's Avatar
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    Apr 2009
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    Re: Just shocking at night

    If you can pass the overnight FC loss test, you are done shocking FWIW, you should raise your CYA level to 30. FC of 5 with CYA at 15 is a bit high, not overly concerning, but rather play it safe.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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  3. Back To Top    #3

    Join Date
    Jul 2011
    Location
    Perrysburg, OH
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    88

    Re: Just shocking at night

    Still haven't passed the OCLT but close... Usually lose 2-3 ppm. Went to wallyworld for CYA today but they were out. I get full sun ALL day! And it has been very sunny....
    16 x 32 inground vinyl pool (21000 gallons) (new liner installed 2014)
    Hayward max flo pump w/ 1 HP AO Smith motor (new motor 2014)
    Hayward C1200 cartridge filter (new 2014)
    Hayward H150 heater

  4. Back To Top    #4
    Butterfly's Avatar
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    May 2007
    Location
    South Carolina
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    10,045

    Re: Just shocking at night

    Quote Originally Posted by Sminor
    Still haven't passed the OCLT but close... Usually lose 2-3 ppm. Went to wallyworld for CYA today but they were out. I get full sun ALL day! And it has been very sunny....
    You can also check your local pool store. You only need about 3 pounds to get CYA to about 30 (assuming 15 now).

    All my haunts were out last year and I wanted CYA, like NOW, and I went to the pool store
    Prices were close to wallyworld. Verify that %CYA is close to 100%.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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    Mod Squad Bama Rambler's Avatar
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    Re: Just shocking at night

    Not maintaining shock level all the time will hamper your progress and cost you a lot more bleach than you would otherwise use. Since you cna swim up to shock level for your CYA I wouldn't be afraid to bring it to shock level each morning and let them swim if they must. At least that way you won't lose as much ground aas just bringing it to shock level at night.
    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
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