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Thread: need to test TA if PH/CH is ok?

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    Diver's Avatar
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    need to test TA if PH/CH is ok?

    if my PH is in good range and stable and my calcium hardness is low, do i even need to test TA?
    26K In-ground Vinyl Pool | Hayward DE4820/SP0710XR50 filter | 1.125 HP Dual Speed Hayward Super Pump | Aquasol Solar

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    Re: need to test TA if PH/CH is ok?

    I would. It's good to know because you can calculate your CSI and learn your scaling potential. It's less of an issue with vinyl lined pools (unless you have a heater) but it is still something that I would want to know.

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    Re: need to test TA if PH/CH is ok?

    I've been testing FC and PH daily and TA about every 4 days to a week unless we have a pool full of people, think this is ok?
    Thanks
    15,000 gallons, Cartridge Filters, IG,

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    JasonLion's Avatar
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    Re: need to test TA if PH/CH is ok?

    Yep. The normal rule is PH and FC daily, TA and CH weekly, CYA, Salt, and Borates twice a year or after massive water replacement.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Diver's Avatar
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    Re: need to test TA if PH/CH is ok?

    Jason,

    Besides cal-hypo and water replacement, is there is something that would effect CH that it would need to be tested weekly?
    26K In-ground Vinyl Pool | Hayward DE4820/SP0710XR50 filter | 1.125 HP Dual Speed Hayward Super Pump | Aquasol Solar

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    JasonLion's Avatar
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    Re: need to test TA if PH/CH is ok?

    It depends on where you live. In the arid portions of the country with which CH fill water and high evaporation rates you need to monitor CH levels very closely. If you live somewhere with high humidity and low CH fill water you can track CH twice a season along with CYA, Salt, and Borates.
    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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    Diver's Avatar
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    Re: need to test TA if PH/CH is ok?

    Quote Originally Posted by JasonLion
    If you live somewhere with high humidity and low CH fill water you can track CH twice a season along with CYA, Salt, and Borates.
    that's exactly where i live - humid summers and extremely soft water.

    as for TA, if PH is steady, is it possible for TA to go far out of range? I understand what can cause PH to go up and down and my understanding was the TA will change as a function of PH since they are closely associated. and if PH is good and steady, would that most likely mean that TA is also where it was before?

    i'm not trying to be lazy and cut on testing - just want to understand the factors that affect TA.
    26K In-ground Vinyl Pool | Hayward DE4820/SP0710XR50 filter | 1.125 HP Dual Speed Hayward Super Pump | Aquasol Solar

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    JasonLion's Avatar
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    Re: need to test TA if PH/CH is ok?

    TA should only change when PH changes or when you add fill water with a significantly different TA level. The main thing about TA is that it can sneak up on you, staying the same for a long time and then changing when you weren't really expecting it to. Technically there is no such behavior, but in practice if often surprises people.
    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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