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Thread: Calcium Hardnes, Total Alkalinity and Ph high

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    Join Date
    Sep 2016
    Location
    Lawrenceville/Ga
    Posts
    3

    Calcium Hardnes, Total Alkalinity and Ph high

    Hello,
    I just got the TF 100 test kit and tested my pool. The results are as follows,

    FC 7.5
    CC 0
    Calcium Hardness 550
    Total Alkalinity 220
    CYA 60
    PH 8.2, I keep lowering the PH with dry acid but it keeps rising back up.

    According to pool math I must drain pool by 1/3 and add 78 oz of dry acid.


    Is there any other way to adjust pool parameters without draining?
    Above ground, 24000 gallons, chlorine 1.5 hp pump, 26 inch sand filter.

  2. Back To Top    #2
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    10,066

    Re: Calcium Hardnes, Total Alkalinity and Ph high

    Welcome to the forum!

    I regularly deal with high CH and TA because of our fill water. It is possible to maintain a pool with high CH and TA but you will need lots of acid to do it. I would target a PH of 7.2 until the TA comes down to a more reasonable level which it will over time. However, you might want to use muriatic acid instead of dry acid because it will be more economical.

    If you want a quicker process, you can try this: Pool School - Lower Total Alkalinity
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    YippeeSkippy's Avatar
    Join Date
    Jan 2012
    Location
    'burbs of Augusta, Georgia
    Posts
    3,939

    Re: Calcium Hardnes, Total Alkalinity and Ph high

    Do you have any idea how your CH got so high?

    I ask because my fill water here in Georgia is only about 45ppm of calcium.

    Don't worry about calcium in a vinyl pool- it doesn't need it.

    Yip
    12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub. Our pool build--> Our Pool Solved Our Sloping Yard Skippy's Cheap Pool Cooler -->Skippy's New Fountain
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  4. Back To Top    #4

    Join Date
    Sep 2016
    Location
    Lawrenceville/Ga
    Posts
    3

    Re: Calcium Hardnes, Total Alkalinity and Ph high

    hi,

    Well I went to the local pool store three times this summer and the pool guy kept giving me buckets of calcium hardness for the pool. I thought it was strange but I just went with it as I hadn't found this site yet. I drained some water today....not 1/3 but as much as I could. I am adding the 78 oz of dry acid and leaving it pump all night. I will check again in the morning. I'm so glad to find you guys.
    Above ground, 24000 gallons, chlorine 1.5 hp pump, 26 inch sand filter.

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