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Thread: Rapid pH rise

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    Rapid pH rise

    I've been neglecting pH the last couple of months, but am currently trying to tame it. It was about 8.3, and I added a gallon of acid on Saturday morning and got it down to 7.5. It rose the next day (yesterday) to 7.8, so I put another gallon and got it down to 6.8. This morning I checked again and it was already up to 7.3. My TA started at 140 and is now down to 110. Should I just keep putting in a gallon a day until TA is down to about 60, and maybe then I'll see it balance a bit so I'm not putting in a gallon per day of 31.75 percent muriatic acid?

    Today's numbers:

    FC = 9
    CC = 0
    pH = 7.3
    TA = 110
    CYA = 25 (I just added 4 pounds of CYA yesterday, as it went from 50 to 0 over the winter).
    CH = 450
    15K gal, PebbleTec, 1/2 HP StayRite pump, Hayward S360SX Pro Series 36in. sand filter, A&A In-Floor Cleaning System (generation 1), connected spa.

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    Mod Squad jblizzle's Avatar
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    Re: Rapid pH rise

    You should use PoolMath to calculate how much acid is needed to lower the pH to 7-7.2 ... not lower than that.

    As the TA drops, the rate of pH rise should lower.
    Jason, TFP Moderator
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    Richard320's Avatar
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    Re: Rapid pH rise

    Use poolmath and target 7.2 pH each time. If you go overboard on the acid, the pH gets too low, and you risk etching metal parts and weakening the plaster holding your pebbletec onto the gunite.

    Since you have the symptom of rapidly rising pH, you're a good candidate for Lowering TA. Run the spa full tilt and let it spill into the pool. There's your aeration.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    epro05's Avatar
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    Re: Rapid pH rise

    My TA was 100 last year and pH always climbed (my pool has fountains and thus plenty of aeration). Then I would add acid to bring it to 7.2, then aerate to raise the pH back up, then add more acid down to 7.2. After quite a few cycles of this, my TA is now 60, and pH seems to be pretty stable at 7.8.
    27,500 gallon in ground gunite/plaster (1995). Attached Spa with fountain, spillway, and 2 lion heads streaming into the pool. Hayward pump and AO Smith UST1152 1.5 hp motor (single speed). Hayward 60 sq ft DE Filter (Model DE-6000). Kreepy Krauly cleaner.

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    Re: Rapid pH rise

    I have an aerator fountain, so I can get aeration with a simple turn of a valve. I will just keep driving it down to 7.2 and let it rise, and push it down again until TA gets to be about 60. Richard, as for the danger of it being at 6.8, since it started at 6.8 and rose to 7.3 in less then 12 hours, my guess is it was at a "sub 7.0" level for just two or three hours at most.

    In a related matter, here is what 4 pounds of CYA granules in two knee-high nylon stockings look like hanging from an empty chlorine dispenser.

    11165273_10206831802940049_7727325821899305196_n.jpg
    15K gal, PebbleTec, 1/2 HP StayRite pump, Hayward S360SX Pro Series 36in. sand filter, A&A In-Floor Cleaning System (generation 1), connected spa.

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    Richard320's Avatar
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    Re: Rapid pH rise

    Excellent picture. I'm stealing it for reference.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Mod Squad pooldv's Avatar
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    Re: Rapid pH rise

    LOL! Good one!
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    Mod Squad jblizzle's Avatar
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    Re: Rapid pH rise

    Anyone else picturing a bull? ... I will show myself out
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Patrick_B's Avatar
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    Re: Rapid pH rise

    TFP Moderator
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