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Thread: Chlorine pucks

  1. Back To Top    #1

    Join Date
    Aug 2015
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    Petersburgh, NY
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    79

    Chlorine pucks

    When I opened my pool I did a CYA test. The CYA is down to 25, due to draining water before closing our pool last season, and adding water this season. So, I would like to raise CYA to about 40.

    I am using liquid bleach to regulate my FC levels, but I am also using a chlorine 3" puck to slowly increase CYA. Does anyone know roughly how much one chlorine puck will raise CYA in a 19,300 gallon pool? I can keep doing a CYA test after each puck dissolves, but that will take a lot of solution from my test kit. I was wondering if anyone knew approximately how many pucks I would need to use to raise the CYA level from 25 to 40.

    Thanks
    Chuck
    - Chuck - My pool: Fiberglass (Aug 2014); 19,324 gallons, 1.5-hp pump; Hayward Sand Filter


  2. Back To Top    #2
    BoDarville's Avatar
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    Jun 2012
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    DFW, Texas
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    Re: Chlorine pucks

    Pool Math has your answer. One 8 oz. trichlor puck will raise CYA by 1.7 ppm. You will need about 9 pucks to raise CYA from 25 to 40 in your pool. It'll take a while to dissolve 9 pucks. In addition, pucks move several parameters. In addition to increasing FC and CYA, pucks also tend to lower pH. For these reasons, we recommend using granular CYA (sometimes marketed as stabilizer). You will need about 40 oz of granular CYA to reach your target level - and you will get there much faster than by waiting for 9 pucks to dissolve. Add the granules into an old gym sock or similar implement and place it in the skimmer. Run the pump until the granules dissolve - it may take a day or two. To hasten the process, give the sock an occasional squeeze. Note that it may take 5-7 days for the newly-added CYA to appear in test results.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
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  3. Back To Top    #3

    Join Date
    Aug 2015
    Location
    Petersburgh, NY
    Posts
    79

    Re: Chlorine pucks

    Thanks for the detailed reply! Very helpful.

    I do have some stabilizer that I dissolved in a bucket with hot water last season. It has been sitting in a covered bucket all winter. Would that still be good to use? I was thinking of using the pucks because I had some left over from last season that I needed to use up.
    - Chuck - My pool: Fiberglass (Aug 2014); 19,324 gallons, 1.5-hp pump; Hayward Sand Filter


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