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Thread: is high pH dangerous?

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    surfhawaii's Avatar
    Join Date
    May 2011
    Kailua, Hawaii

    is high pH dangerous?

    ph in the hot tub always seems to rise and I control it, but ran out of 'ph down' late one night and really wanted to get in. was just curious, is it dangerous to your body to sit in a hot tub with a ph of 8.0?
    22k gallon, Sand filter (Triton II TR 100)
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    Re: is high pH dangerous?

    pH rise due to aeration will be limited to a pH of 8.3. As long as the pH rise was due only to aeration, is is safe to use.

    Note that the pH should not be left high as scaling can occur.
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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: is high pH dangerous?

    Many people have tap water higher than that and they bathe in it. But most people don;t sit in the tub for as long as you sit in a hot tub, and they minimize the eye contact. I doubt you harmed yourself any.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Join Date
    Mar 2013
    Houston, TX

    Re: is high pH dangerous?

    I read this: from Ben's website and it seems that, in some specific situations, a higher pH level (8.0) could be beneficial, or at the very least, not harmful. I'm currently experimenting on my pool; I will post results back soon.
    18,000 gallon IG Gunite pool. White Pebblesheen. Flagstone Coping. 9' diameter level spa. 430sf Hayward Cartridge Filter. 2.5hp Hayward Ecostar VSP for filter. 1hp Hayward Super II Pump for waterwall. 400k BTU Hayward Universal H-Series natural gas heater. Ozonator (it was free). Hayward Prologic PS8 Controller.

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    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: is high pH dangerous?

    Quote Originally Posted by macmini
    I read this: from Ben's website and it seems that, in some specific situations, a higher pH level (8.0) could be beneficial, or at the very least, not harmful. I'm currently experimenting on my pool; I will post results back soon.
    I hope you have low CH in your pool or you are inviting scaling by keeping the pH too high.
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    Smykowski's Avatar
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    Sep 2011
    Gurnee, IL (North Suburban Chi-town)

    Re: is high pH dangerous?

    "In some specific situations..." being the operative and very important words above. I would call those situations too few and far between to talk about here.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
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    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: is high pH dangerous?

    Are you using the Dichlor-then-bleach method? You indicated before that you started with pool water in your spa so got the CYA that way and then used bleach, so essentially you are on that method. So you should have the TA be lower at around 50 ppm and also use 50 ppm Borates (usually from boric acid) as that should help keep the pH from rising as quickly. If your spa water is fairly isolated, then this should be fairly easy to do. If your spa water mixes too much with your pool water, then it will be hard to have the TA be that different in your spa and your pool, though Borates could be used in both if you wanted to do that (though that's more expensive, given the volume of the pool).
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