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Thread: 68% cal hypo shock vs 73%

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    Join Date
    Jun 2016
    Audubon pa

    68% cal hypo shock vs 73%

    Is 73% cal hypo shock worth the extra cost over the 68% for weekly/ biweekly use? Vinyl pool approx 17500 gallons.

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    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    DFW, TX

    Re: 68% cal hypo shock vs 73%

    Welcome to TFP!

    At the bottom of Poolmath is a tool called Effects of Adding Chemicals. Enter your gallons at the top and the amount of each type of cal-hypo to see how much FC each adds to your pool. Then you can do the math to see which is a better value. Also, note the amount of CH that each adds to your pool and make sure you don't add too much CH and risk calcium scaling.

    More here on both
    Pool School - How to Chlorinate Your Pool
    Pool School - Calcium Scaling
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    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: 68% cal hypo shock vs 73%

    Welcome to TFP!!!

    I also wanted to add that we do not recommend a weekly "shock". TFP teaches to always maintain proper chlorine (FC) levels as a function of your stabilizer (CYA) level to keep the pool clean and safe. By doing so, there is never a need to randomly add a bunch of extra chlorine on an arbitrary schedule.
    Jason, TFP Moderator
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