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Thread: How long is chlorine good for?

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    Modawg2k's Avatar
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    May 2013
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    How long is chlorine good for?

    I have some liquid chlorine left over from a previous summer in my garage. How long is the stuff good for? It's been in the hot garage, but out of any sunlight. Any degradation?
    ~15k gallons, 3'-5'-4' Figure 8 Shape In Ground
    Wetedge Satin Matrix Interior (Pebble)
    Paramount In-floor System
    Pentair IntelliFlo VS 3050, Pentair Triton II TR100 Sand Filter
    Pentair Intellichlor IC40 SWG

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    Join Date
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    N Tonawanda, NY
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    Re: How long is chlorine good for?

    I'd bet it has lost some of its strength but have no idea how much.
    If your chlorine level isn't high then use pool math to see how much will bring it up 2ppm. Add that amount & see if actually goes up 2 ppm.
    16' x 34' vinyl in ground - 16,500 gal.
    Hayward EC-75 DE filter with Hayward 1hp Super Pump
    TF-100XL Test Kit with SpeedStir

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    duraleigh's Avatar
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    Re: How long is chlorine good for?

    It depends. There is a degradation chart somewhere on the forum but I can tell you you have VERY little left, if any.

    Too hot, too long
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Modawg2k's Avatar
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    Re: How long is chlorine good for?

    Thanks I tossed it


    ~15k gallons, 3'-5'-4' Figure 8 Shape In Ground
    Wetedge Satin Matrix Interior (Pebble)
    Paramount In-floor System
    Pentair IntelliFlo VS 3050, Pentair Triton II TR100 Sand Filter
    Pentair Intellichlor IC40 SWG

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    Jul 2015
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    Burkburnett/TX
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    57

    Re: How long is chlorine good for?

    I would have used it. Can't see how it would hurt...would only cost a couple drops of reagents.

    Sean
    17X34 above ground painted concrete pool. 32" deep on the shallow end, 44" on the deep end. Sand pool filter.

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    Join Date
    Mar 2007
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    San Rafael, CA USA
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    Re: How long is chlorine good for?

    As shown in this table, chlorinating liquid will degrade rather quickly in hotter temperatures. I'm guessing that over a year it might be at 3-4% at best. Mostly the chlorine degrades into chloride and chlorate (poor quality chlorinating liquid also degrades into oxygen gas).
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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