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Thread: Pool Was Devouring Chlorine

  1. Back To Top    #1

    Join Date
    Sep 2009
    Location
    TN
    Posts
    45

    Pool Was Devouring Chlorine

    I recently posted that after a week of shock, I was still not passing the overnight drop test. (I found out I wasn't dilligent enough about keeping it at the target level and brushing. So I raised the shock level from 16 to 18 to give me a little buffer.)
    After really getting after it, here are my numbers. I know I probably kept it at shock longer than required, but after a coyuple of weeks of battling algae, I wanted to make sure.

    Am I correct that I am ready to go back to Target FC?


    Constant readings:
    pH 7.7
    TA 100
    CH 123
    CYA 40

    Temps 72-78 degrees

    Water is crystal clear, brown and white particles collect at vinyl seams on floor during the day.

    Brushing pool everyday (getting brown “dust” , pollen or dirt?, with each stroke, not visible until brushed)

    Wednesday
    7:30pm FC 15 CC .5 121oz bleach
    10pm FC 18.5 CC 0

    Thursday
    6am FC 17.5 CC 0 24oz bleach
    5pm FC 15 CC .5 182oz bleach and 32oz algaecide (poly)
    8:30pm FC 15.5 CC 0 182oz bleach
    10pm FC 17 CC 0 48oz bleach
    Midnight FC 18.5 CC 0

    Friday
    6am FC 17.5 CC .5 24oz bleach
    7:30pm FC 9.5 CC .5 411oz bleach
    10pm FC 15.5 CC 0 182oz bleach
    Midnight FC 19.5 CC .5 (overshot my target of 18)

    Saturday
    6am FC 19.5 CC .5
    new in 2009 - 18' x 36' IG vinyl liner, 23,300 gallons
    24" sand filter w/ 1.5hp pump
    Polaris 280 cleaner w/ booster pump

  2. Back To Top    #2
    Butterfly's Avatar
    Join Date
    May 2007
    Location
    South Carolina
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    10,045

    Re: Pool Was Devouring Chlorine

    You passed the overnight test last night and your cc is .5, so you should be done shocking

    Time to let the FC drift down to maintenance range.

    Suggest you keep an eye on the brown/white particles collecting at the seams and keep them brushed up to let the filter take it out.
    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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  3. Back To Top    #3

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,084

    Re: Pool Was Devouring Chlorine

    Suggest you keep an eye on the brown/white particles collecting at the seams and keep them brushed up to let the filter take it out.
    Yeah, I agree. In fact, that sounds suspiciously like a little more dead algae that you're killing.

    That you held the FC overnight, though, would indicate you've got virtually all of it.

    Like butterfly, I would let it drift back dowqn to maintenance range.

    Nice work!!
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  4. Back To Top    #4
    frustratedpoolmom's Avatar
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    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,965

    Re: Pool Was Devouring Chlorine

    Good job - hey, when that FC drops below 10, be sure to retest the PH and adjust it up if necessary. FC levels above 10 can make the PH read higher than it really is...
    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

  5. Back To Top    #5

    Join Date
    Sep 2009
    Location
    TN
    Posts
    45

    Re: Pool Was Devouring Chlorine

    Okay, this is a relief. I should have bought stock in Clorox before this episode.
    This is my first year with this pool and everything has been a learning lesson. So, next year should be much easier getting it opened.
    Thanks all, and thank you Pool School!
    new in 2009 - 18' x 36' IG vinyl liner, 23,300 gallons
    24" sand filter w/ 1.5hp pump
    Polaris 280 cleaner w/ booster pump

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