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Thread: Overnight Free Chlorine Loss Test

  1. #1
    Junior Member
    Join Date
    Aug 2009
    Location
    Bloomington, IL
    Posts
    11

    Overnight Free Chlorine Loss Test

    I realize to do the OCLT, I should turn off any chlorine source. Is it OK to leave the pump running all night for circulation or should I turn the pump off also?

    Thanks
    IG
    Vinyl
    27,000 gallons
    DE filter
    BBB Method
    Taylor K-2006C Test Kit
    Opaque automatic cover.
    Pool usually covered unless there are swimmers.

  2. #2
    Mod Squad linen's Avatar
    Join Date
    Jul 2010
    Location
    Twin Cities, MN
    Posts
    8,770

    Re: Overnihgt Free Chlorine Loss Test

    As long as you give the chlorine enough time to mix (maybe and hour), you can do it with pump off, but you will want to be up extra early to get your pump moving the water a while before doing the morning test. IMO, it is better to just leave it on, but it doesn't have to be.
    TFP Moderator 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.

  3. #3
    Junior Member
    Join Date
    Aug 2009
    Location
    Bloomington, IL
    Posts
    11

    Re: Overnight Free Chlorine Loss Test

    Thanks, Linen. One further question. Usually I do the morning test for the OCLT before the pump has been turned on and before the water is circulating. Does that make my free chlorine test invalid?
    IG
    Vinyl
    27,000 gallons
    DE filter
    BBB Method
    Taylor K-2006C Test Kit
    Opaque automatic cover.
    Pool usually covered unless there are swimmers.

  4. #4
    Mod Squad linen's Avatar
    Join Date
    Jul 2010
    Location
    Twin Cities, MN
    Posts
    8,770

    Re: Overnight Free Chlorine Loss Test

    It could, since there can be localized consumption of chlorine.
    TFP Moderator 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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