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Thread: Losing FC levels in SWG

  1. Back To Top    #1

    Join Date
    May 2008
    Location
    Illinois
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    6

    Losing FC levels in SWG

    Good morning!

    Trying to find a solution to keep CL in pool.

    36000 gal inground vinyl liner
    SWC intellichlor IC40 (2nd season)
    Taylor Test Kit

    Levels this morning:

    FC 0
    CC .5
    PH 7.5
    CA 80
    TA 90
    HARDNESS 210
    Salt reading high this morning at 3800 recommended 3400.

    Water is clear but not lively. Last week worked for 2 days getting TA and PH within range. (lower then arete)
    Ph was 7.9 yesterday added acid and it returned to 7.5.
    Why am I not generating enough CL
    Also with a CA of 80 and a TA of 90 should the TA be higher?
    The CA may go higher in a few days as I added CA last friday.
    When taking a test at the return CL is reading 2.0 but no reading elsewhere in the pool.

    Shocked last week w/ bleach (cloudy water) after high temps and high bather load cleared up over nite but did not hold CL.
    Been running generator at 100% for 3 days....

    Been a pool owner for aver 20 years never had a problem of pool not holding CL.

    Thinking I should shock again? Then add fresh water to reduce the salt??

    Thanks in advance.

    Nancy
    Nancy

  2. Back To Top    #2
    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    Re: Losing FC levels in SWG

    Most likely you have a low level algae problem. The SWG is keeping the algae in check, but never completely killing it off. If you shock the pool you should be able to kill all the algae and the SWG will go back to being able to keep up.

    Your salt level is only a little high. You should be fine leaving the salt level where it is.
    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

  3. Back To Top    #3

    Join Date
    May 2008
    Location
    Illinois
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    Re: Losing FC levels in SWG

    Thank you for the quick reply..time to shock.

    One more question. Should I turn off the generator as I shock? Not wanting to over tax the generator, since it has been
    running for 3 days at 100%.

    Thanks again.

    Nancy
    Nancy

  4. Back To Top    #4
    JasonLion's Avatar
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    Re: Losing FC levels in SWG

    I generally turn off the SWG when shocking, but you don't have to.
    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

  5. Back To Top    #5
    Butterfly's Avatar
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    May 2007
    Location
    South Carolina
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    10,045

    Re: Losing FC levels in SWG

    You don't want to run your SWG at 100%. It cannot 'shock' your pool.
    But at the normal run %, it is not problem allowing it to help maintain a shock level.

    Remember to turn it off if/when you do the Overnight FC Loss Test.
    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.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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  6. Back To Top    #6

    Join Date
    Oct 2010
    Location
    Georgia
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    Re: Losing FC levels in SWG

    poolschoolgrad

    20x40 free-form IG vinyl, 1hp Hayward superpump, Hayward pro grid DE filter, Raypak heatpump, Goldline Aquarite SWCG, Polaris 280 with booster, and tested using a Taylor K2006.

  7. Back To Top    #7
    susa's Avatar
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    Oct 2010
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    Deep South
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    578

    Re: Losing FC levels in SWG

    >> CYA?

    according to OP, it is 80

    how old is the Cell ?

  8. Back To Top    #8

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    Re: Losing FC levels in SWG

    oops

    PSG
    poolschoolgrad

    20x40 free-form IG vinyl, 1hp Hayward superpump, Hayward pro grid DE filter, Raypak heatpump, Goldline Aquarite SWCG, Polaris 280 with booster, and tested using a Taylor K2006.

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