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Thread: Chlorine Usage

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    Chlorine Usage

    Pool very clear but it has a larger Chlorine appetite. Trying to reduce Chlorine usage. I typically put in 1 gallon of liquid chlorine (12.5%) each evening which raises CL by 5 ppm. The next evening back at 4 ppm. Pump runs 24 hrs a day (20 hrs low rpm & 4 hrs high rpm after chlorine add). Pool seems to stay clearest at 8 to 10 ppm. Float 3 pucks a week in chlorine floater.

    FC 4 ppm (before the 1 gallon add)
    CC 0 ppm
    ALK 120
    PH 7.6
    CYA 70

    Any suggestions.
    Kenbob
    inground, 23,000 gallons, vinyl liner, sand filter, 2 speed Whisperflo 1.5 HP, gas heater

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    Mod Squad JohnT's Avatar
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    Re: Chlorine Usage

    At 70ppm CYA, 4 or 5 is too low for your chlorine. You should try to stay at 8 and never let it get below 5.
    TFP Moderator
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    Re: Chlorine Usage

    Thanks. What is most economical way at keeping at 8 ppm. 4 Gallons of CL cost me $10.00 so a week equals $17.50.
    Kenbob
    inground, 23,000 gallons, vinyl liner, sand filter, 2 speed Whisperflo 1.5 HP, gas heater

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    Re: Chlorine Usage

    I would suggest performing the OCLT (it's in Pool School) The chlorine usage you indicate seems excessive and I think you have something living in your pool.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Mod Squad jblizzle's Avatar
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    Re: Chlorine Usage

    And always keeping pucks in the floater is continually increasing your CYA which is already on the high side. 3 pucks/week is almost 4ppm CYA increase per week.

    Pull the floater. Do the OCLT. Shock if required.
    Jason, TFP Moderator
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    Re: Chlorine Usage

    I did the OCLT test. Results as follows.

    Wed 6:15 PM the CL was 4.5 ppm.
    Added a 1 gallon CL
    Wed 8:30 PM the CL was 11.5 ppm.
    Thur 5:45 AM the CL was 11.5 ppm.
    CL stayed at same level through night
    Kenbob
    inground, 23,000 gallons, vinyl liner, sand filter, 2 speed Whisperflo 1.5 HP, gas heater

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    Re: Chlorine Usage

    Only 2 things consume chlorine in your pool....sunlight and organics

    Your first post, if I interpret it correctly, indicates you are losing 5ppm daily. The OCLT indicates none of that loss is at night so there is nothing organic in your pool to consume the chlorine. The ONLY thing left is that sunlight is consuming 5ppm of your FC daily.

    With a CYA of 70, that chlorine consumption is at least double what I would expect based on reports here on the forum and I have absolutely no explanation for it.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Chlorine Usage

    Appreciate the quick response. I use the FAS-DPD method for CYA measurements. Is there a better CYA measurement method to get a better CYA as that is the only thing I can think of ... CYA higher than I am reading .... then I would need to drain some water to get the CYA back down.
    Kenbob
    inground, 23,000 gallons, vinyl liner, sand filter, 2 speed Whisperflo 1.5 HP, gas heater

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    JasonLion's Avatar
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    Re: Chlorine Usage

    The black dot test is the best available CYA test, though it does leave a lot to be desired. Take a look at the extended directions for some pointers on the best way to do the test.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Chlorine Usage

    Quote Originally Posted by kenbob57
    Appreciate the quick response. I use the FAS-DPD method for CYA measurements. Is there a better CYA measurement method to get a better CYA as that is the only thing I can think of ... CYA higher than I am reading .... then I would need to drain some water to get the CYA back down.
    You are losing me a little. Are you thinking higher CYA is the cause of your chlorine loss? It isn't.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Chlorine Usage

    Thanks. Your correct that high CYA is not causing my lose in Chlorine. So OCLT test was good. Will a solar cover during the day slow chlorine consumption? Will the solar cover cause other issue.
    Kenbob
    inground, 23,000 gallons, vinyl liner, sand filter, 2 speed Whisperflo 1.5 HP, gas heater

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