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Thread: need help with TA and Ph

  1. Back To Top    #1

    Join Date
    May 2014

    need help with TA and Ph

    Hello all, been using TFP for my pool for years with little to no problems. Hot tub for almost a year no problems. Not sure what happened but my hot tub numbers are all over the place. have a sundance Marin 880 315 gallons:

    FC 2
    CH 300
    TA who knows as soon as i add the green solution it turns bright red
    Ph 6ish or lower.
    temp at 101

    admittedly i was traveling so a week or so went by without attention and very little if any use.

    I assume i need to keep ph low to lower TA and aerate to raise Ph back up. should i add some Ph increaser? how long will this take to lower Ph. I would have thought my TA would have dropped given the low Ph for at least a week.


    - - - Updated - - -

    so i need to slap my wrist. went back to the Pool School for extended test kit help. I should have known all answers are generally on this site. so i am misreading my tests. what is my first step? bring Alkalinity back into play and then manage the Ph or reverse? thanks.
    17k gallons, IG pebble, cartridge; TF-100 test kit

  2. Back To Top    #2

    Join Date
    Nov 2015
    appleton wisconsin

    Re: need help with TA and Ph

    Alkalinity needs to be up to par in order for aeration to cause PH to rise.

    Low ph in spas is generally caused by the use of dichloro chlorine power. That stuff is acidic.

    Most of us use dichlor until CYA levels get to an appropriate level (20-80, depending on who you ask), then switch to liquid chlorine/bleach.

    Liquid chlorine raises PH slightly over time.

    You can raise alkalinity with baking soda, or washing soda. PH increaser would be washing soda in fancy packaging.

    Also 50ppm borates is recommended frequently here at tfp as a component of your buffers. Do search here to learn how to do that if you wish.
    340 gallon stand alone spa.

  3. Back To Top    #3

    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: need help with TA and Ph

    Yes, bring your TA up until you get a result....even if it 10 ppm.

    Then bring pH up to 7.2 with Borax.

    Last, retest TA and adjust it to about 80 ppm.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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