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Thread: Is low TA okay is CSI is inline?

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    ITR's Avatar
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    Nov 2014
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    Is low TA okay is CSI is inline?

    Just tested the pool...TA has gone down, but CSI is inline. Should I raise TA or leave it there?

    pH: 7.8 (added 4oz of HCL after test)
    FC: 4 (Added 1 qt of bleach to bring up to the target of 5)
    CC: 0
    TA: 55 (5 drops turned it red...6 drops turned it bright pink)
    CH: 375
    CYA: 30
    Temp: 81
    CSI: 0.07
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    15' x 29' 10,300 gal w/ spa, IG-Plaster (Stonescapes Tropics Blue), 2spd WhisperFlo pump (1.5hp WFDS-26), Pentair Clean and Clear CC200 cartridge filter, Pentair MasterTemp 300BTU heater, Clear o3, RS-8 iAqualink

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    JasonLion's Avatar
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    Re: Is low TA okay is CSI is inline?

    You don't really want TA below 60 unless you are using borates. However, 55 is very close to 60, so you don't need to rush to raise it right this instant or anything.

    In addition to affecting CSI, TA affects how chemical additions change the PH. When TA gets (way) too low the PH can swing around wildly when chemicals are added. We want the PH to be fairly stable, so don't want TA getting too low.
    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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    duraleigh's Avatar
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    Re: Is low TA okay is CSI is inline?

    TA: 55 (5 drops turned it red...6 drops turned it bright pink)
    Color change tests are not completed until the last drop makes NO color change whatsoever. If 6 drops changed the color, you need to add more until the color doesn't change at all.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    ITR's Avatar
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    Re: Is low TA okay is CSI is inline?

    Thanks, Jason. pH has been stabilizing a bit. It's nice to not have to use two or three gallons of HCL every week anymore. I will go ahead and toss some baking soda in tomorrow.


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    15' x 29' 10,300 gal w/ spa, IG-Plaster (Stonescapes Tropics Blue), 2spd WhisperFlo pump (1.5hp WFDS-26), Pentair Clean and Clear CC200 cartridge filter, Pentair MasterTemp 300BTU heater, Clear o3, RS-8 iAqualink

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