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Thread: Calculating pH Impact of Cal-Hypo, Bleach, & Other Chlorines

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    Calculating pH Impact of Cal-Hypo, Bleach, & Other Chlorines

    The Pool Calculator's "Effects of Adding Chemicals" helps me estimate the pH impact of Trichlor, but not Cal-Hypo or Bleach. My 50,000-gal community pool uses a Trichlor feeder, and I'm investigating the possibility of reducing Trichlor usage and combining with Bleach or Cal-Hypo for a net pH neutral chlorine strategy. Maybe even a slight list to the high pH side, as our make-up water is acidic and the Trichlor is always pulling it down as well. Anyway, how might I approach Cal-Hypo or Bleach from a pH perspective? Would be great if I could say X amount of Trichlor would be offset by Y amount of [high-pH chlorine source like Cal-Hypo or Bleach]. Then I might attempt to split the chlorinating task accordingly between the two for a pH-neutral effect.

    Thanks!!
    50-Yr Old, 50,000-Gal, In-Ground Plaster-Covered Brick

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    Re: Calculating pH Impact of Cal-Hypo, Bleach, & Other Chlor

    Calcium hypochlorite and bleach are essentially pH neutral.

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    Richard320's Avatar
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    Re: Calculating pH Impact of Cal-Hypo, Bleach, & Other Chlor

    Bleach has a neutral net pH change, as does Cal-hypo. That's why the pool calculator doesn't show it.

    That was easy.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Re: Calculating pH Impact of Cal-Hypo, Bleach, & Other Chlor

    Fascinating! Thank you both!

    We have low CH here (western NC), and there's a giant tub of Cal-Hypo in the storage room, so I may focus on the Cal-Hypo rather than the Bleach. Perhaps if I bring enough of that into play then I can phase out that pesky, acidic Trichlor..

    Thanks!!
    50-Yr Old, 50,000-Gal, In-Ground Plaster-Covered Brick

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    duraleigh's Avatar
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    Re: Calculating pH Impact of Cal-Hypo, Bleach, & Other Chlor

    If you haven't tested for CYA, you should.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Calculating pH Impact of Cal-Hypo, Bleach, & Other Chlor

    The CYA test is a strange one, and I'm never quite sure I'm performing it correctly. But yes I'm doing it, and that little black dot finally disappears completely when the scale reads somewhere in the 30 - 40 ppm range.

    I'm rapidly coming around to ya'lls "BBB" philosophy, though at the moment I'm seeing it more as a focus on chlorination, getting that chlorine in the way that best balances other secondary measures like CYA or CH.

    This forum is fantastic! The grace with which the forum experts tolerate the newbies -- and for so many years now -- is amazing.

    Thanks!!
    50-Yr Old, 50,000-Gal, In-Ground Plaster-Covered Brick

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    Re: Calculating pH Impact of Cal-Hypo, Bleach, & Other Chlor

    OK. Made the mistake of trying to buy sodium hypo from a pool supply. None of the stores I contacted had it. Of course they have lots of other products they recommend instead. AND they use the ruse that bleach is high pH and will monkey with the pool pH. That directly contradicts what Richard is saying. What going on here? Salesmanship?
    50-Yr Old, 50,000-Gal, In-Ground Plaster-Covered Brick

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    Re: Calculating pH Impact of Cal-Hypo, Bleach, & Other Chlor

    Yep, they are trying to pool store you.

    What is your pool's surface? Plaster, vinyl, or fiberglass?
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    Re: Calculating pH Impact of Cal-Hypo, Bleach, & Other Chlor

    Plaster. So since we have really low CH in our make-up water I was open to Cal-Hypo. May still be. But handling that stuff is so unnerving. Noxious fumes when you open that big bucket, and you know years are being erased from your life. I'm imagining that opening a jug of bleach and pouring it directly into the water is less dangerous than wrestling that huge Cal-Hypo bucket and then having to pre-dissolve the granules.

    What's the cost-effective approach to buying bleach for a 50,000 pool?
    50-Yr Old, 50,000-Gal, In-Ground Plaster-Covered Brick

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    JasonLion's Avatar
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    Re: Calculating pH Impact of Cal-Hypo, Bleach, & Other Chlor

    In most cases most cost effective is to buy 12% bleach from a pool store or cleaning supply company. However, sometimes places like WalMart/Target/Aldis etc are less expensive. It all depends on what your local prices are
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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