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Thread: Can Chlorine tablets go bad?

  1. Back To Top    #1

    Join Date
    Jan 2011
    North Texas

    Can Chlorine tablets go bad?

    Don't worry, I am just using them for new plaster start up, but am starting to wonder if they have gone bad. I have had 3 pucks in since a week ago today and added 2 more 2 days later and I am still getting the .5-1 reading when I test. I am adding liquid chlorine in as well ( started 3 days ago) but without much if any CYA in the pool right now, it evaporates pretty quickly. Seems I am putting 1 96 oz bottle in every day since to maintain around FC 3.
    The bucket of pucks stayed closed in their container in our shed over the did get pretty nasty for here weather wise, but the shed door was closed and there was no direct contact with precip.
    15,000 gallons, Cartridge Filters, IG,

  2. Back To Top    #2

    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Can Chlorine tablets go bad?

    Post subject: Can Chlorine tablets go bad?
    Probably not. While you don't give any clue as to the size of your pool, your FC loss sounds normal to me.

    3 pucks in a normal size pool will not have much effect on FC or CYA. The liquid chlorine you put in is quickly consumed by the sun.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Can Chlorine tablets go bad?

    Without much CYA in there you're gonna lose whatever chlorine you're adding each day.
    If my math is correct, you've only added 5 tabs in there. That's good for about 3ppm per day in a 15,000 gal pool and you've only added about 8 ppm CYA. You need to add more tabs and if they're in a floater you need to open it up a bit more.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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