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Thread: pH or Alkalinity

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    pH or Alkalinity

    What's more important to correct when your pH is 8.0 and alkalinity is 80? Also, will sulfuric acid reduce pH while leaving alkalinity stable?
    8 K pool, cc 100 filter, Auto-Pilot SWG, 1 HP Whisper-Flo pump, in-ground gunite pool 9 yrs. old,solar heat and Pentair 250K heater.

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    Re: pH or Alkalinity

    Use muriatic acid to lower your pH down to 7.4-7.6. I'd do that pretty quickly.

    Then, test your TA again. If it's below say around 70, you can bring it up with baking soda. The baking soda will have little effect on the pH.

    You can use Jason's calculator in my sig.

    Ask any questions you may have. Lots of nice people here to help.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: pH or Alkalinity

    Thanks, but doesn't a low TA require bi-carb, and a low pH soda ash?
    8 K pool, cc 100 filter, Auto-Pilot SWG, 1 HP Whisper-Flo pump, in-ground gunite pool 9 yrs. old,solar heat and Pentair 250K heater.

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    Re: pH or Alkalinity

    Baking soda = sodium bicarbonate, raises TA without much effect on pH.
    Soda ash = sodium carbonate, raises both pH and TA.
    Borax (as in 20 Mule Team) raises pH without much effect on TA [included here for completeness].
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

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    Butterfly's Avatar
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    Re: pH or Alkalinity

    Hi jaybo500,

    Recommended TA for SWG pools is 60 to 90, so yours is right in line.

    Here's our Pool School article for pool-school/water_balance_saltwater_generator

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