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Thread: Struggling to keep pH down

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    Join Date
    Oct 2016
    Location
    Austin TX
    Posts
    4

    Struggling to keep pH down

    Hi all. I seem to be frequently adding acid to keep pH in a reasonable range. It will rise to 8.2 within a few days of bringing it down to 7.5-7.8.

    This morning's test results after adding 18 oz of acid yesterday afternoon:
    FC 7.0
    CC 0
    pH 7.5
    TA 70
    CH 400
    CYA 60

    The table below shows abbreviated test results and acid added as a result. I use PoolMath to determine how much acid to add for a target of 7.5.

    Date TA pH Muriatic Acid Oz
    09/30/2016 80 8 18
    10/1/2016 100 7.8 11
    10/04/2016 80 8.2 18
    10/05/2016 80 7.8 9
    10/08/2016 80 8 18
    10/11/2016 90 7.8 9
    10/14/2016 90 8.2 18


    I mostly have the water fountain turned-off to keep aeration from increasing the pH.

    Is this just normal for my pool or is something else affecting pH?

    Thanks,
    Steve
    First time pool owner April 2016 | 11,300 gallons IG Plaster with Water Fall | Tagelus TA 50 Sand filter | Jandy SHPF Pump | Polaris PB4-60 Booster Pump | Polaris 280 Cleaner | TF-100 Test Kit

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    Jimrahbe's Avatar
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    Jul 2014
    Location
    Bedford, TX
    Posts
    1,188

    Re: Struggling to keep pH down

    Steve,

    If this is a new pool or has new plaster, that will cause pH to rise. Your waterfall (aeration) will also cause pH to rise.

    I suggest you try this...

    Measure and record your TA. Use pool math and drop your pH to 7.0 and immediately turn on your waterfall. Wait three or four hours and measure and record TA again. Measure pH and then add acid to drop it to 7.0 again. Wait three or four hours and measure TA and pH again. Do this same process over and over, until your TA drops to 60 and then let the waterfall run until your pH gets back up to 7.5 or so.

    Thanks,

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP5200 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2.

  3. Back To Top    #3

    Join Date
    Oct 2016
    Location
    Austin TX
    Posts
    4

    Re: Struggling to keep pH down

    Thank you for the recommendation, Jim.

    The pool is about six years old.

    Steve
    First time pool owner April 2016 | 11,300 gallons IG Plaster with Water Fall | Tagelus TA 50 Sand filter | Jandy SHPF Pump | Polaris PB4-60 Booster Pump | Polaris 280 Cleaner | TF-100 Test Kit

  4. Back To Top    #4

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    duraleigh's Avatar
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    Apr 2007
    Location
    Sebring, Florida
    Posts
    28,401

    Re: Struggling to keep pH down

    This is the process that Steve describes.....

    Pool School - Lower Total Alkalinity
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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