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Thread: The twelve most common myths in Pool-Water Chemistry

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    Azmp1's Avatar
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    The twelve most common myths in Pool-Water Chemistry

    Some very good read. Pretty much all of this been discussed here and I read here in various topics, but still some good info, all in one place.

    The twelve most common myths in Pool-Water Chemistry | PPOA


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    Mod Squad jblizzle's Avatar
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    Re: The twelve most common myths in Pool-Water Chemistry

    I just started reading it and already do not agree with some of the statements in #2.

    - - - Updated - - -

    And 5 has some false statements.
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    The twelve most common myths in Pool-Water Chemistry

    Really? I thought 2 was spot on from what I read on here. Can you elaborate?


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    Mod Squad jblizzle's Avatar
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    Re: The twelve most common myths in Pool-Water Chemistry

    9 is not quite right.

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    Quote Originally Posted by Azmp1 View Post
    Really? I thought 2 was spot on from what I read on here. Can you elaborate?
    It is this part that I do not agree with:
    On the other hand, superchlorination, calculated to reach chemical breakpoint to eliminate existing chloramine, is necessary when it’s necessary; that is, it’s needed when these ammonia compounds have been allowed to develop.
    specifically the idea of a "chemical breakpoint" ... it could just be the way that they worded it. But that buzz word has been misused many times.

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    For 5:
    Chlorine does not work "much better" at lower pH levels ... if there is any CYA in the water, like we recommend.

    For 9:
    5-25ppm CYA is too low for an outdoor pool and they say not to use it for indoor pools which we disagree with.
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    Re: The twelve most common myths in Pool-Water Chemistry

    Ah I see. For 2, I think what he means by it is the chlorine level needed to be achieved to start effectively working, like in the SLAM process. 5-25 CYA jumped at me as well, but as far as indoor pools, why do you need at in the indoor pool? I though it was exclusively sunlight related as well?


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    Mod Squad jblizzle's Avatar
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    Re: The twelve most common myths in Pool-Water Chemistry

    Because CYA also significantly buffers the chlorine as well (in other words makes it less harsh).

    Check out this table which shows the "harshness":
    http://richardfalk.home.comcast.net/.../pool/HOCl.htm
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    Re: The twelve most common myths in Pool-Water Chemistry

    CYA also acts as a buffer for chlorine. Without CYA, you'd want to keep your FC around 0.1ppm. Hard to do, hard to test. A little CYA gives you much more flexibility and a wider tolerable FC range.
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    The twelve most common myths in Pool-Water Chemistry

    Got Ya. Thank you. Since we're talking about CYA, can you guys also explain why you need to run at higher CYA level with SWG?


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