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Thread: Is it Worth changing low T/A

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    smeestu's Avatar
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    Is it Worth changing low T/A

    Hi all been using the bleech method for several months now and couldnt be happier pool stays crystal clear and i finally feel i have some sort of control on whats going on in there after many hours of reading on here and learning lots of usefull information . My question is my T/A has dropped to 30 as checked today doesnt seem to be making any problems my ph raises from 7.4/7.5 to 7.8/7.9 over about 8-10 days then i put 2 litres of 31% MA in drops it back to 7.4/7.5 on it goes i understan this is lower the T/A over time just wondered at what point you start adding baking soda as in lower parameters for T/A or just get it back up to around 50 then every time i put MA in put a bit of baking soda in to off set the effect of the MA.
    Thanks in advance for any help

    PH 7.7
    CL 5.0
    TA 30
    CH 220
    CYA 38
    Water Temp 19.5C (much cooler than normal)
    Home built Concrete pool tiled 100% 6M X 12M 1.1-1.6 m deep 93,000 litres 24,500 US gallons
    Emaux SB15 1.5hp pump ,Emaux v700B Sand Filter with Zealbrite
    Emaux SSC50-T 45g/hr swg ,Jacuzzi chlorine Tablet Feeder

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    Re: Is it Worth changing low T/A

    Have you calculated your csi? I know that I raised my TA from to 70 to help with the csi value.
    ~Paul
    19x40 IG including 10' BE, 18,000 gal, plaster, 48 SF DE, 1.5HP pump, AquaPure SWCG, Ozonejoe 30MR, Rockwaterfall, LED light, TF-100 Fill date 11/21/2014
    My ODK Build | My Pool Build | If You're From Texas Vote Here

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    pwrstrk's Avatar
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    Is it Worth changing low T/A

    To low of a TA can cause etching of the pool surfaces. I would get your TA back up to 70-80 range using baking soda and see how your PH likes it there. When it falls to 50-60 I'd raise it back up.

    What test kit are you using and how did you come up with a CYA level of 38 ?
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    smeestu's Avatar
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    Re: Is it Worth changing low T/A

    Hi thanks fot the advice im using a Palintest which has marking on it in 10s on the side i checked it twice and its about 4/5s between 30 and 40 maybe .I will raise the TA back up was wondering really if its worth doing it as i do the MA at 2 litres it drops TA in my size pool by 11 so 2kg of Baking Soda equals the loss ( i read it will raise the ph by .03 ) just wondered how other people done it really or just let it drop a fair bit then bring it back up
    Home built Concrete pool tiled 100% 6M X 12M 1.1-1.6 m deep 93,000 litres 24,500 US gallons
    Emaux SB15 1.5hp pump ,Emaux v700B Sand Filter with Zealbrite
    Emaux SSC50-T 45g/hr swg ,Jacuzzi chlorine Tablet Feeder

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    JasonLion's Avatar
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    Re: Is it Worth changing low T/A

    Unless you are using borates, it is best not to let TA go below about 60. Having TA at 50 for a few days is no big deal, but down around 30 you are well into the range where you could have problems. If you are using borates, then TA at 40 is the lower limit, and 30 for a few days is no big deal.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    smeestu's Avatar
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    Re: Is it Worth changing low T/A

    Quote Originally Posted by Jabooh1 View Post
    Have you calculated your csi? I know that I raised my TA from to 70 to help with the csi value.
    i just checked my CSI its 0.71 Corrosion of plaster likely better up the TA soon whats interesting as well is the massive differnce Temp makes to CSI my pool has been at 30-35 for the last 8 months now it at 19 makes a big difference thanks for the advice
    Home built Concrete pool tiled 100% 6M X 12M 1.1-1.6 m deep 93,000 litres 24,500 US gallons
    Emaux SB15 1.5hp pump ,Emaux v700B Sand Filter with Zealbrite
    Emaux SSC50-T 45g/hr swg ,Jacuzzi chlorine Tablet Feeder

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    Re: Is it Worth changing low T/A

    Yes temp is a huge driver of csi.
    ~Paul
    19x40 IG including 10' BE, 18,000 gal, plaster, 48 SF DE, 1.5HP pump, AquaPure SWCG, Ozonejoe 30MR, Rockwaterfall, LED light, TF-100 Fill date 11/21/2014
    My ODK Build | My Pool Build | If You're From Texas Vote Here

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    smeestu's Avatar
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    Re: Is it Worth changing low T/A

    Quote Originally Posted by JasonLion View Post
    Unless you are using borates, it is best not to let TA go below about 60. Having TA at 50 for a few days is no big deal, but down around 30 you are well into the range where you could have problems. If you are using borates, then TA at 40 is the lower limit, and 30 for a few days is no big deal.
    Thanks for the reply i will go put 2 kg of baking soda (which is all i have here at the mo ) in now and keep it above 60
    Home built Concrete pool tiled 100% 6M X 12M 1.1-1.6 m deep 93,000 litres 24,500 US gallons
    Emaux SB15 1.5hp pump ,Emaux v700B Sand Filter with Zealbrite
    Emaux SSC50-T 45g/hr swg ,Jacuzzi chlorine Tablet Feeder

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    pwrstrk's Avatar
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    Re: Is it Worth changing low T/A

    As long as you keep all your parameters in their recommended range's you can pretty much ignore the CSI.
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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