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Thread: PH rising rapidly 35 day old plaster, going to lower TA

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    PH rising rapidly 35 day old plaster, going to lower TA

    Plaster is about 35 days old now. I have put about 10 gallons of muriatic acid in already and it still comes right back up. Does this seem excessive? I'm going to try to lower the TA by aerating. Do you think my 3 24" waterfalls, spa spillway, and spa jets are enough to aerate, or should I make something that brings the returns up out of the water? Does it matter if I aerate all at once to get it done quickly, or can I just do it over several days through normal operation so I don't have to run the pump all night?

    Thanks in advance!
    15,000 gallon gunite pool, grey plaster with 8' raised spa
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    Mod Squad JohnT's Avatar
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    Re: PH rising rapidly 35 day old plaster, going to lower TA

    I imagine your new plaster and all of the aeration you get is responsible for the pH rise. TA is probably a minor effect, and just running the pool is going to lower it as you compensate for the plaster and aeration.

    My bet is your pool will always be hard to control pH with all the aeration, but it should get better after the plaster gets a year or so on it.
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    Re: PH rising rapidly 35 day old plaster, going to lower TA

    ****, I was afraid to hear that. I'm spending more on acid than a junkie!
    15,000 gallon gunite pool, grey plaster with 8' raised spa
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    frustratedpoolmom's Avatar
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    Re: PH rising rapidly 35 day old plaster, going to lower TA

    What is your TA?
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    JasonLion's Avatar
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    Re: PH rising rapidly 35 day old plaster, going to lower TA

    You should be almost done with the lots and lots of acid period. Fresh plaster typically raises the PH rapidly for about a month, and then more slowly for up to a year.

    Your waterfalls are great for aeration.
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    Re: PH rising rapidly 35 day old plaster, going to lower TA

    I just tested the TA and it was acutally only 80 so I guess I wont be trying to lower it. I havnt checked it lately and thought it was higher. PH was back up to 8 or higher so I dumped in another gallon of 14.5% muriatic acid. Is Home Depot's price of $5 per gallon a decent price for that stuff or should I look elsewhere?
    15,000 gallon gunite pool, grey plaster with 8' raised spa
    Jandy PlusHP Pump 2 HP Dual Speed
    Sta-Rite 450 Sq. ft. Cartridge Filter
    Cleva-Chlor RP40HD
    Raypak 400k btu heater
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    Savi Melody 12v LED lights

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    Mod Squad JohnT's Avatar
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    Re: PH rising rapidly 35 day old plaster, going to lower TA

    Quote Originally Posted by n8scstm
    I just tested the TA and it was acutally only 80 so I guess I wont be trying to lower it. I havnt checked it lately and thought it was higher. PH was back up to 8 or higher so I dumped in another gallon of 14.5% muriatic acid. Is Home Depot's price of $5 per gallon a decent price for that stuff or should I look elsewhere?
    Get the 31.45% and you won't go through so much, and you can get it for less than $10 a gallon.
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    Re: PH rising rapidly 35 day old plaster, going to lower TA

    I get two gallons of 31.45 at Lowes for $10.92
    Geometric 16X36', 16K gal, shotcrete, exposed aggregate plaster, acrylic coated concrete deck/cantilever coping;
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    Re: PH rising rapidly 35 day old plaster, going to lower TA

    The lowes by my house doesnt have the 31.45. They have the same 14.5 as HD for the same price. Any other ideas of where I can find the 31.45? I'm still using a gallon of acid everytime I turn on my waterfalls.
    15,000 gallon gunite pool, grey plaster with 8' raised spa
    Jandy PlusHP Pump 2 HP Dual Speed
    Sta-Rite 450 Sq. ft. Cartridge Filter
    Cleva-Chlor RP40HD
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    svenpup's Avatar
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    Re: PH rising rapidly 35 day old plaster, going to lower TA

    My neighborhood pool store has gallons of 31.45% for $4.25 so it is worth checking pool stores.
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    Ohm_Boy's Avatar
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    Re: PH rising rapidly 35 day old plaster, going to lower TA

    I'm going to try to lower the TA by aerating.
    Not to belabor the point, but aerating does not lower TA.
    Adding acid lowers the TA as well as the PH. Aerating just facilitates raising the PH back up.
    [center:1kpalu48]Helpful Links: Pool School | CYA/Chlorine Chart | Pool Calculator[/center:1kpalu48]

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    Re: PH rising rapidly 35 day old plaster, going to lower TA

    If you know that turning off your waterfalls has the pH not rise as quickly, then you can lower your TA even further to reduce the pH rise effect from the waterfalls. I wouldn't go any lower than 50 ppm and you should try 60 ppm first, but if you lower the TA you'll need to raise the CH to compensate. In the short run, just see if the pH rise slows down when the pH is around 7.8 and the TA is lower. If it is, then you could adjust the CH later and target the pH down a bit.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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    Re: PH rising rapidly 35 day old plaster, going to lower TA

    Quote Originally Posted by Ohm_Boy
    I'm going to try to lower the TA by aerating.
    Not to belabor the point, but aerating does not lower TA.
    Adding acid lowers the TA as well as the PH. Aerating just facilitates raising the PH back up.
    I know. I meant lower the TA by using the aerating procedure as a whole. Wasn't just going to turn on the waterfalls.
    15,000 gallon gunite pool, grey plaster with 8' raised spa
    Jandy PlusHP Pump 2 HP Dual Speed
    Sta-Rite 450 Sq. ft. Cartridge Filter
    Cleva-Chlor RP40HD
    Raypak 400k btu heater
    Jandy Aqualink RS-8 One Touch
    Savi Melody 12v LED lights

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    Re: PH rising rapidly 35 day old plaster, going to lower TA

    Quote Originally Posted by chem geek
    If you know that turning off your waterfalls has the pH not rise as quickly, then you can lower your TA even further to reduce the pH rise effect from the waterfalls. I wouldn't go any lower than 50 ppm and you should try 60 ppm first, but if you lower the TA you'll need to raise the CH to compensate. In the short run, just see if the pH rise slows down when the pH is around 7.8 and the TA is lower. If it is, then you could adjust the CH later and target the pH down a bit.
    Raise the CH in Southern California? I've never heard of having to do that here.
    15,000 gallon gunite pool, grey plaster with 8' raised spa
    Jandy PlusHP Pump 2 HP Dual Speed
    Sta-Rite 450 Sq. ft. Cartridge Filter
    Cleva-Chlor RP40HD
    Raypak 400k btu heater
    Jandy Aqualink RS-8 One Touch
    Savi Melody 12v LED lights

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    Re: PH rising rapidly 35 day old plaster, going to lower TA

    I was assuming that your saturation index wasn't already too high. You should use The Pool Calculator to see where you are at after you've adjusted the TA and the pH is stable where you want it. You are right that you may not need to adjust the CH if the saturation index is still OK.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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    Richard320's Avatar
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    Re: PH rising rapidly 35 day old plaster, going to lower TA

    Quote Originally Posted by n8scstm
    Raise the CH in Southern California? I've never heard of having to do that here.
    Boy, ain't that the understatement of the year!
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