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Thread: Sodium Hypo and ph

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    Sodium Hypo and ph

    I was wondering how directly chlorine usage is responsible for the ph rise in pool water. I am wondering if there is a way to quantify it, if it is. My thinking is... Would it be possible to add HCl (very dilute HCl I imagine) to my chlorine holding tank on my stenner chlorine feed system.
    15k gal inground Viking fiberglass pool; Hayward Variable 1.5hp pump (Maxflo VS); Hayward swimclear 325 sg ft cartridge filter; Raypak 206A 199k btu nat gas heater; Aquabot Bravo robotic pool cleaner

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    Re: Sodium Hypo and ph

    Insignificant. pH rise is usually due to aeration from SWGs, fountains, bubblers, etc.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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    Re: Sodium Hypo and ph



    Not if you enjoy living. Acid plus chlorine make chlorine gas, diluted or not. Chlorine does raise the pH when added, but then it comes back down as the chlorine is consumed. If you are having problems with your pH constantly rising your TA is more likely the cause.

    So please don't add acid to your chlorine tank.
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter. Dual speed 1 HP pump, Hayward S210T sand filter
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    Re: Sodium Hypo and ph

    Quote Originally Posted by Donldson View Post


    Not if you enjoy living. Acid plus chlorine make chlorine gas, diluted or not. Chlorine does raise the pH when added, but then it comes back down as the chlorine is consumed. If you are having problems with your pH constantly rising your TA is more likely the cause.

    So please don't add acid to your chlorine tank.
    I do notice that my ph tends to rise gradually .. I am currently adding (via stenner) 38 fl oz/day of 12.5% hypo and its been working well. About one a week, I need to add 6-8 fl oz of 37% HCl. I usually add when ph is 7.8 and shoot to bring it down to 7.4 My HCl usage has been very consistent.
    15k gal inground Viking fiberglass pool; Hayward Variable 1.5hp pump (Maxflo VS); Hayward swimclear 325 sg ft cartridge filter; Raypak 206A 199k btu nat gas heater; Aquabot Bravo robotic pool cleaner

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    Re: Sodium Hypo and ph

    What is your TA?
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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    Mod Squad jblizzle's Avatar
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    Re: Sodium Hypo and ph

    It is pretty normal for the pH to tend to rise ... unless you are using acid solid chlorine products.
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    Re: Sodium Hypo and ph

    Quote Originally Posted by RobbieH View Post
    What is your TA?
    110 (last i tested about 5 days ago)
    15k gal inground Viking fiberglass pool; Hayward Variable 1.5hp pump (Maxflo VS); Hayward swimclear 325 sg ft cartridge filter; Raypak 206A 199k btu nat gas heater; Aquabot Bravo robotic pool cleaner

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    JasonLion's Avatar
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    Re: Sodium Hypo and ph

    Lowering your TA will eliminate, or at least greatly reduce, the PH drift.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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