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Thread: Ta 25 Ph 8 what to do first?

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    Ta 25 Ph 8 what to do first?

    Ta 25 Ph 8 what to do first?
    My spa is 225 gallon (ca 900 ltr)
    Factory is Caldera
    Above ground
    6 months old now.

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    Re: Ta 25 Ph 8 what to do first?

    I would adjust pH first. I never pay attention to TA. Others may disagree about the TA. But for sure you need to get that pH down. 8 is just too high.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    Re: Ta 25 Ph 8 what to do first?

    +1 what pabeader says......I assume you mean TA 250 which will probably be a good idea to adjust after you bring pH into the 7's
    Dave S.
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    Re: Ta 25 Ph 8 what to do first?

    Quote Originally Posted by duraleigh View Post
    +1 what pabeader says......I assume you mean TA 250 which will probably be a good idea to adjust after you bring pH into the 7's
    Makes sense, as a rising PH is a lot of times contributed to high TA. I am still working on finding my sweet spot.

    Sorry, thought it was a pool.
    Last edited by Catanzaro; 09-18-2015 at 09:58 AM. Reason: Correction - Not Pool
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    Re: Ta 25 Ph 8 what to do first?

    This is a spa, not a pool. If the TA is truly at 25 ppm, I'd bring the TA up first using baking soda (the pH will not change much at all) and then lower the pH using acid. 40 grams of baking soda (sodium bicarbonate) and 7 grams of dry acid (sodium bisulfate) in your 225 gallon spa should get you to a TA of 50 ppm with a pH of 7.5. See this thread which was the most recent one from the OP prior to this one where the TA was 96 ppm and was getting lowered via the acid/aeration procedure at low pH. So is this situation from overshooting when lowering the TA?

    How did the TA get this low? It shouldn't normally drop when using a hypochlorite source of chlorine. It should only drop from some net acidic chemical such as Dichor or non-chlorine shock (MPS) or acid. If you were cumulatively adding around 35 ppm FC over time to build up CYA, then that would lower the TA by about 12 ppm, but that would have the TA go from 50 to around 40 ppm, not 25.

    The use of 50 ppm borates should help reduce the rate of pH rise, but boric acid or sodium tetraborate (borax) can be hard to obtain in Europe (the OP noted it was not available in the Netherlands). [EDIT] See this post where apparently one can get boric acid in the Netherlands. [END-EDIT]
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    Re: Ta 25 Ph 8 what to do first?

    Chem geek Thx.
    yes iT is 25 i bring iT up with baking soda.
    My spa is 225 gallon (ca 900 ltr)
    Factory is Caldera
    Above ground
    6 months old now.

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    Re: Ta 25 Ph 8 what to do first?

    Boric acid can be purchased in the Netherlands. Google for "boorzuur prijs"
    Arctic Spa Klondike Legend SE
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    Re: Ta 25 Ph 8 what to do first?

    FYI - "boorzuur prijs" translates to boric acid price.

    Very Interesting!
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    Re: Ta 25 Ph 8 what to do first?

    edwin2014

    Boric acid is indeed not a problem, but the testing strips for testing boric acid is a problem.
    I don,t use chemicals if i cannot test it.
    My spa is 225 gallon (ca 900 ltr)
    Factory is Caldera
    Above ground
    6 months old now.

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    Re: Ta 25 Ph 8 what to do first?

    As far as I know you add this one time only and via poolmath you would be able to calculate the exact amount needed (as far as I understood). So yes, bit of blind trust in tfp poolmath.
    Arctic Spa Klondike Legend SE
    AG / Filter Cardtrige 50m2/ TFP / borates / TF100
    478 gallon @ 99.5-103.1 F Depending on season
    Ozonator disconnected

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    Re: Ta 25 Ph 8 what to do first?

    Yes, you really don't need to test the borates. Just add the proper amount after each refill. It doesn't break down so should last through until the next water change and its exact level isn't important. You just want enough for decent pH buffering and 50 ppm is a good amount, but even 30 ppm will help and 70 ppm is not dangerous.

    Now for a pool that's a different matter where testing is important because you generally don't replace all the water so need to know how much got diluted so one can bring it back up, usually once a season.
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    Re: Ta 25 Ph 8 what to do first?

    Chemgeek And Edwin thx.

    The water in my spa now is 5 weeks old.
    can i add it now? or do i wait till new refill??
    My spa is 225 gallon (ca 900 ltr)
    Factory is Caldera
    Above ground
    6 months old now.

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    Re: Ta 25 Ph 8 what to do first?

    You can add it at any time.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Re: Ta 25 Ph 8 what to do first?

    Thanks
    My spa is 225 gallon (ca 900 ltr)
    Factory is Caldera
    Above ground
    6 months old now.

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