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Thread: TA at 40 but PH holding steady at 7.5 for over a month

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    Join Date
    Mar 2015
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    TA at 40 but PH holding steady at 7.5 for over a month

    I have a few questions for the expert folks here:

    I have been consistently getting 7.5ph for months now but my TA has been low at 40. (Im using a brand new TFT-100 kit). Should I worry so much about my low TA if I'm getting great ph readings? Last year I had to dump tons of acid into the pool every two weeks to keep my ph levels down. Now it just sits there perfect.

    Do I need to raise my TA to 80 even when I'm not having ph issues?

    If so, can I add baking soda while my children swim?

    Thanks in advance!
    Saltwater 8000 30ft round AGP / 22,000 gal / 1Hp Hayward variable speed super pump / Hayward 150sqft cartridge filter / Hayward Aquarite 25k gal salt system / katchakid

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    JoyfulNoise's Avatar
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    Re: TA at 40 but PH holding steady at 7.5 for over a month

    Your TA is lower than I'd be comfortable with especially if you don't have borates in your water. Since your pH is stable, it's ok but you should keep an eye on both as you don't want either of them to start drifting lower. You could adjust your TA up in 10ppm increments and see what effect that has on pH because at some point increasing your TA will cause your pH to start to creep up.

    Your pool is not in any danger as long as you keep tabs on your pH and TA. They seem to have found a decent equilibrium.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: TA at 40 but PH holding steady at 7.5 for over a month

    Thanks for the clarification
    Saltwater 8000 30ft round AGP / 22,000 gal / 1Hp Hayward variable speed super pump / Hayward 150sqft cartridge filter / Hayward Aquarite 25k gal salt system / katchakid

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    duraleigh's Avatar
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    Re: TA at 40 but PH holding steady at 7.5 for over a month

    Stability is the goal. That certainly is low, but if your pool is stable, I would run with it. Check pH often through the summer and pat yourself on the back!
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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