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Thread: Cal hypo has a very high PH

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    Join Date
    May 2014
    Davenport, Florida

    Cal hypo has a very high PH

    Quote Originally Posted by Casey View Post
    High calcium can lead to clouding of the water and if the pH gets too high, along with the calcium from over use, it can put an unsightly scale on your liner and ruin it. Bleach, which has salt (sodium hypochlorate) adds a minimal amount of salt to the water unlike Cal Hypo, Tri Chlor and Di Chlor and is the safest of all because it doesn't have additives that will drive the water parameters out of whack.
    That's not exactly true, in that sod hypo has a very high pH, circa 11-13, so if you don't add acid at the time you add sod hypo you will drive the pH up, because the sod hypo has a high acid demand. This increased pH then slows down the effect of the added chlorine, because of the inverse pH/chlorine relationship. Rule of thumb is for every jug (20 pints) of sod hypo added, also add a pint of acid. Obviously this only applies if the pH is correct before the addition of the sod hypo. If the pH is out then the amount of acid needs to be adjusted accordingly.

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Cal hypo has a very high PH

    Welcome to TFP!

    Sodium hypochlorite and Cal hypo both have a fairly high PH, however the process of chlorine getting used up (either sanitizing or from breakdown by sunlight) is acidic. The net effect of adding either one is PH neutral when both effects are taken into account.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Cal hypo has a very high PH

    +1 what JasonLion said.

    I am curious as to the use of "sod hypo" what does that mean?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Smykowski's Avatar
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    Sep 2011
    Gurnee, IL (North Suburban Chi-town)

    Re: Cal hypo has a very high PH

    Sodium Hypochlorite?
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