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Thread: Eye irritation and pH level

  1. Back To Top    #1

    Join Date
    Oct 2011

    Eye irritation and pH level

    Hello all,
    All things being equal for other parameters: what level of pH will cause less eye irritation?
    Low pH of around 7.2 or high around 7.8?

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  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Eye irritation and pH level

    Low PH has much more of an effect on your eyes than high PH. Most people feel some eye irritation below 7.2, though a few people start to notice problems at 7.2 or even just slightly higher (quite rare however). On the high end you can go up quite a bit over 7.8 before you notice anything.
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  3. Back To Top    #3

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Eye irritation and pH level

    See this post for more details about studies on eye irritation and pH. Chloramines were much more irritating than a pH what was off unless it was WAY off (outside 7 to 9). The salt level also had a lot to do with preventing irritation (human tears have around 9000 ppm salt). Nevertheless, we occasionally get some reports as Jason noted where it seems that being too low in pH is more noticeable than too high (relative to 7.5).
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