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Thread: TA recommended level question

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    Woodberg's Avatar
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    Apr 2009
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    Houston, TX (Candlelight Estates)
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    TA recommended level question

    For an inground concrete pool, why is the recommended level of TA 70-90 when using bleach and 100-120 when using Trichlor?
    20,000 gallon gunite pool, attached spa, Pebblesheen finish, Paramount PCC-2000 infloor cleaning system, Paramount ClearO3 ozone system, Intelliflo VS main pump, Whisperflo 1HP cleaner pump, StaRite cartridge filter, StaRite heater

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    37,887

    Re: TA recommended level question

    Trichlor is acidic, and is constantly lowering both the PH and the TA. In order to keep the PH from falling too quickly the recommended TA level is higher.

    When using bleach, which is PH neutral in the long run, the dominant effect of TA is to slowly push the PH up as CO2 outgases. To minimize this effect the recommended TA level is lower.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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