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Thread: Ph rises daily

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    Ph rises daily

    I've tried to maintain an active Ph of 7.4-7.6 but it rises daily about 0.4Ph.

    I live in Phoenix and have metal stains that I'm currently working on. This is due to neglect from previous pool service and myself. I've been onboard with the TFP program for about 5 or 6 months now and test my pool almost daily. I recently added the borates hoping to stabilize this but it seems the same amount of chlorine and acid are needed as before. After adding all the Borax and Acid I was steady at 7.4Ph for two days. I then rechecked it on the third day and it was at 8.0Ph.

    Is it possible it's just the water? It's barely drinkable down here and I obviously have some copper coming in as well.



    FC 7
    Ph 7.6
    TA 100
    CH 260
    CYA 50
    Borate 50
    In-Ground 12000 Gallon Pool/Plaster Walls/Hayward S244T Sand Filter/Chlorine/1.5 HP pump
    Phoenix, AZ

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    Smykowski's Avatar
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    Re: Ph rises daily

    Its probably the TA of 100. If you lower that it should slow the pH rise, though that might be a little more difficult with the borates in the water.

    How do you chlorinate? SWG, manually, or other?
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    linen's Avatar
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    Re: Ph rises daily

    I agree with smy that your TA is too high for a borated pool and is likely causing your ph rise. Additionally, any aerating features will also raise ph, such as water jets, waterfalls, etc.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

  4. Back To Top    #4

    Re: Ph rises daily

    I use liquid chlorine that I pour in myself from the jug.

    All waterfalls and aerators are off. I'll bring down the TA and report back.
    In-Ground 12000 Gallon Pool/Plaster Walls/Hayward S244T Sand Filter/Chlorine/1.5 HP pump
    Phoenix, AZ

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    Richard320's Avatar
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    Jan 2010
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    Re: Ph rises daily

    Quote Originally Posted by labbatsbrew
    I use liquid chlorine that I pour in myself from the jug.

    All waterfalls and aerators are off. I'll bring down the TA and report back.
    Just keep knocking pH down and TA will eventually drop. It'll use the same amount of acid whether you accelerate the process or not.
    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!

  6. Back To Top    #6

    Re: Ph rises daily

    TA now down to 80.

    When should I stop?

    FC- 50
    Ph- 7.4
    TA- 80
    CH- 300
    CYA- 50
    Borates- 50
    In-Ground 12000 Gallon Pool/Plaster Walls/Hayward S244T Sand Filter/Chlorine/1.5 HP pump
    Phoenix, AZ

  7. Back To Top    #7
    linen's Avatar
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    Re: Ph rises daily

    You can go as low as 50 ppm TA with 50 ppm Borates. With that said, I would probably go a little further since your fill water is likely high in TA...maybe shoot for 70 ppm then see how your ph stability is.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

  8. Back To Top    #8

    Re: Ph rises daily

    Will do. Thanks
    In-Ground 12000 Gallon Pool/Plaster Walls/Hayward S244T Sand Filter/Chlorine/1.5 HP pump
    Phoenix, AZ

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