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Thread: Is it normal for TA and Calcium readings to go up??

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    ship of fools's Avatar
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    Nov 2011
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    Is it normal for TA and Calcium readings to go up??

    My water is great and all is well

    But .... i have been consistently testing low on CH (40+- but it's a vinyl) and 40+- on TA as well but wasn't too worried because my ph was stable.

    I did a complete round of tests today and both the calcium (90) and TA (70) readings were much higher than in past tests. We have had a boatload of rain over the past 4-6 weeks but other than that the pool has seen nothing but liquid chlorine.

    Here are the complete test results .... which are great and the water has been perfect all season

    CL 6.0
    CC 0
    ph 7.4
    CYA 35+-
    ch 90
    ta 70

    Any thoughts on the TA and CH rise??
    21,000 gallon inground
    Haywood Sand Filter
    Vinyl Liner

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    Mod Squad jblizzle's Avatar
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    Re: Is it normal for TA and Calcium readings to go up??

    As water evaporates, the CH remains and the fill water adds more ... so pretty normal for the CH to rise.
    What is the TA of your fill water? That could also cause the TA to rise.
    Jason, TFP Moderator
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    ship of fools's Avatar
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    Re: Is it normal for TA and Calcium readings to go up??

    Quote Originally Posted by jblizzle
    As water evaporates, the CH remains and the fill water adds more ... so pretty normal for the CH to rise.
    What is the TA of your fill water? That could also cause the TA to rise.

    Only fill water has been from mother nature .... would rain do it?
    21,000 gallon inground
    Haywood Sand Filter
    Vinyl Liner

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    JasonLion's Avatar
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    Re: Is it normal for TA and Calcium readings to go up??

    Not usually, rain typically lowers TA. There are occasional exceptions however, so it is possible.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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