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Thread: little help on pH level and total alkalinity please

  1. Back To Top    #1

    Join Date
    Sep 2013
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    little help on pH level and total alkalinity please

    This may be a dumb question but my excuse is I'm new.

    My pH is 7.2, a little low I understand.
    But my total alkalinity is 120 ppm a little high right?

    Does that make sense? Item 1 tells me I need to add soda ash but item 2 tells me to add acid. Isn't that contradictory?

    any help gratefully received.
    1) 14,000 gals
    2) DE filter
    3) In ground
    4) concrete
    5) Flow rate of filter; 120

    Location - San Diego, California

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    JasonLion's Avatar
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    Re: little help on pH level and total alkalinity please

    7.2 is good. As long as your PH doesn't go down any further you can leave things alone and the PH will tend to go up on it's own.

    Note: If you are using trichlor tablets, the above does not apply and you should raise the PH with soda ash. The recommended TA is higher when using trichlor.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: little help on pH level and total alkalinity please

    Thanks for the reply. I just googled trichlor and found out what it is and yes I'm using it so I should use soda ash.

    However, should I add acid to lower TA?
    1) 14,000 gals
    2) DE filter
    3) In ground
    4) concrete
    5) Flow rate of filter; 120

    Location - San Diego, California

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    Mod Squad jblizzle's Avatar
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    Re: little help on pH level and total alkalinity please

    Really what you should do is stop using trichlor before your CYA gets to be unmanageably high. Read these:
    ABCs of Water Chemistry
    Recommended Pool Chemicals
    How to Chlorinate Your Pool

    What is your current CYA? Post up a full set of test results.

    EDIT: And no you should not add acid ... it lowers pH and TA and your pH is already at the lower limit.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    linen's Avatar
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    Re: little help on pH level and total alkalinity please

    Welcome to tfp, Spiny Norman

    The trichlor you are using is very acidic and will lower TA and ph, that is why you should use washing soda to raise ph now (it will also raise TA up a good bit). As jbliz said, long-term a better solution is to move away from the trichlor pucks.
    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.

  6. Back To Top    #6

    Join Date
    Sep 2013
    Location
    San Diego, California
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    Re: little help on pH level and total alkalinity please

    Thanks guys I appreciate the help
    1) 14,000 gals
    2) DE filter
    3) In ground
    4) concrete
    5) Flow rate of filter; 120

    Location - San Diego, California

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