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Thread: PH Rising too fast

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    Mar 2012
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    PH Rising too fast

    Hi there,

    I have a 10080 gallons plaster pool with SWG that was built 4 months ago. I have read that new plaster pools have high acid demand, but mine seems too high.

    I lower the PH to 7.4 and on day 2 is 7.6 and on day 3 is 8. I lowered it to 7.0 on a Monday and checked it in on Friday and it was 8.0. Only the PH is rising, the TA is stable.

    Is this normal? If not, any suggestion on how to make the PH stable?

    I have a Taylor Kit and the current levels are:

    FC 6
    CYA 70
    TA 70
    CH 290
    PH 7.8
    Salt 3600
    Borates 45
    Water Temp 84

    Thanks
    10080 gallons 28x12 rectangular pool. 1HP Hayward Maxiflo pump. 75 sqft Hayward Cartridge Filter. SWG Hayward Aquarite. iRobot Verro 300 Pool Cleaner. Plaster color Pewter.

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    Re: PH Rising too fast

    I certainly agree that that is a very rapid rise and am not sure why yours is different. By far, the most important part is to keep it in the 7's, regardless of the cause.

    It will surely slow down but the consequences of letting your pH go into the eights and stay there for any extended period are not good at all.

    Get some more muriatic and monitor both TA and pH. Your TA should lower as your pH lowers. If it doesn't, the testing is not correct.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3

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    Re: PH Rising too fast

    Dave thanks for the quick reply.

    TA is lowering but not every time I put acid. It was around 90 and it is now 70. I am planning to raise it to 80 when it gets to 60.

    Will raising CYA to 80, 90, or 100 help reducing the PH rate of increase?

    Also I have a couple of sprinklers next to the pool and some water from them gets into the pool. They are on twice a day for 30 min. could the aeration from the sprinklers be contributing to the PH increase?
    10080 gallons 28x12 rectangular pool. 1HP Hayward Maxiflo pump. 75 sqft Hayward Cartridge Filter. SWG Hayward Aquarite. iRobot Verro 300 Pool Cleaner. Plaster color Pewter.

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    Re: PH Rising too fast

    Will raising CYA to 80, 90, or 100 help reducing the PH rate of increase?

    Also I have a couple of sprinklers next to the pool and some water from them gets into the pool. They are on twice a day for 30 min. could the aeration from the sprinklers be contributing to the PH increase?
    Raising the CYA will not help. For my taste, that's just a little too high anyway so keep it where it is.

    The sprinklers are surely not contributing enough to even consider. I wish I could pinpoint why your rate of increase is high but I can't....I can only emphasize the importance of keeping it under control.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  5. Back To Top    #5

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    Re: PH Rising too fast

    Thanks, I will keep my PH in the 7s and hopefully get a lower rate of increase in the future.
    10080 gallons 28x12 rectangular pool. 1HP Hayward Maxiflo pump. 75 sqft Hayward Cartridge Filter. SWG Hayward Aquarite. iRobot Verro 300 Pool Cleaner. Plaster color Pewter.

  6. Back To Top    #6

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    Re: PH Rising too fast

    Your new plaster is contributing to the rapid ph rise. You will need to adjust the ph almost daily or every other day to keep it in check for the first few months. The ph will stabilize with time as the plaster continues to cure.
    17,000 gal, IG Gunite Diamond Brite plaster Kidneybean,w/7x11 tanning ledge& 3x5 swimout bench,244T 300lb Hayward Pro high rate sand filter(63 GPM) , Hayward 1Hp Super Pump w/3/4 hp booster pump, Polaris 280, Laars Lite 2 175k N/G Heater, Tf-100, Speed stir

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    Re: PH Rising too fast

    Your experience is very similar to mine. My pool is 16 months old and I'm still adding about 30 oz. of MA every 5 days or so to drop the pH back down to around 7.5 or 7.6. But for the first 3-4 months I was going through about 4 gallons of MA each month. Even more during the first month.
    9,200 gal. Gunite Luna Quartz French Grey pool with spill over spa, two fountains on tanning ledge (rarely used)
    Pentair Whisperflo 2HP, Pentair CCP Cartridge 420 Sq. Ft., Polaris 280 with booster pump
    Pentair EasyTouch 4, RayPak LoNox 266k Natural Gas heater, Aqua Rite SWCG T Cell 9, Borates, TF-100 test kit

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    Re: PH Rising too fast

    Will it be ok to drop the PH to 7.0 and wait until it gets to 7.8 to drop it back to 7.0? I am not sure if a PH of 7.0 is harmful for the pool. I know that below 7.2 tend to make eyes sting, but I can time it so it is not below 7.2 on the weekend when we usually use the pool.
    10080 gallons 28x12 rectangular pool. 1HP Hayward Maxiflo pump. 75 sqft Hayward Cartridge Filter. SWG Hayward Aquarite. iRobot Verro 300 Pool Cleaner. Plaster color Pewter.

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    Re: PH Rising too fast

    It's fine to do but I don't think you're gaining much and your operating just a little outside normal. still OK but I wouldn't think it worth the trouble to have to monitor pH more closely.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    XsAllOverIt's Avatar
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    Re: PH Rising too fast

    I've got a 22000 gallon pool and it's 1 3/4 years old and I'm still adding about gallon muriatic acid over a month period. I do have a waterfall that contributes, but it was much more than that at the beginning. Cheap maintenace being that it will probably be the only thing you'll be adding all year.
    18 x 36 Inground Gunnite, White Plaster 21K gallon
    18" raised spa, 8' Diameter (620 gallon)
    Triton II Sand filter, Intellichlor IC40 SWG
    Pentair Pump, Max-E-Therm 400 BTU
    Lamotte ColorQ PRO 7-Plus test kit
    TFT-100 test kit

  11. Back To Top    #11

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    Re: PH Rising too fast

    Thanks all for the help
    10080 gallons 28x12 rectangular pool. 1HP Hayward Maxiflo pump. 75 sqft Hayward Cartridge Filter. SWG Hayward Aquarite. iRobot Verro 300 Pool Cleaner. Plaster color Pewter.

  12. Back To Top    #12
    susa's Avatar
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    Re: PH Rising too fast

    Acid Automation has been a big help for our family pools in addition to keeping Alkalinity at 50 or less and Borate at 50

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