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Thread: TA

  1. Back To Top    #1
    bof's Avatar
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    TA

    Help

    My pool is 19500 gals
    FC 5.8
    Temp 20 C
    Ph 7.7
    CYA 75
    TA 0

    Is this right it was at 25 2 weeks ago. Can the ta be at zero, I have tested this twice and got the same result. Can anyone help me with the this. All advice welcome.
    Living in Cyprus
    In ground overflow pool tiled 12m X 4m 19507 Us gals 16243 Imp gals
    1 Kw motor 15 cu m per min Sand filter
    I thought I saw the light at the end of the tunnel but it was just some PERSON with a torch walking toward me.
    I started out in life with nothing and I still have most of it left.

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    Patrick_B's Avatar
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    Re: TA

    Hey Bof,

    Just covering the simple stuff here, did you add acid since the last test?

    Are your sure the pH is correct? Usually, a higher TA would be expected at a 7.7 pH.

    Did the test turn red immediately when you first started to titrate with the final reagent?
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  3. Back To Top    #3
    Richard320's Avatar
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    Re: TA

    It's hard to give advice to you, since I know the preferred test kits and chemicals are not readily available cheaply in Europe.

    If you've been chlorinating with dichlor or trichlor powdered chlorine, then it's very possible your TA has dropped that low. They are both acidic. You should have added baking soda when TA was at 25 - that's way too low. Your surface may be tile, but the grout can still be weakened by etching, so you should consider it a plaster pool. .
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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  4. Back To Top    #4

    Re: TA

    It's not possible to have a TA of zero with a pH of 7.7 and a cya of 75.. The test titrates down to a pH of 4.5 to get to zero TA. Your tests are probably not accurate. How are you testing?

    It's theoretically possible to have a very low TA and a pH of 7.7. For example, distilled water with a little hydroxide to raise the ph. In that case, there is no alkalinity to buffer the ph change, but the hydroxide would measure as TA in the titration test.

    In your case, your cya of 75 would contribute about 25 ppm TA at a pH of 7.7.

    Also note that whatever brought down the TA would have brought down the pH. Even if you had a lot of aeration, the pH would not go up. In fact, once you pass the equilibrium point with CO2, aeration will lower the pH.

    Have you ever used bromine or bromide salt?

    Have you ever used a hydroxide base, like sodium hydroxide, to raise the pH?

  5. Back To Top    #5
    bof's Avatar
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    Re: TA

    Hi all
    Sorry about my delay in replying I am using a Scuba 2 digital tester. I have found that occasionally my results are way off, but I do not know why. I have checked my results with a friend who has a great test kit, and the results are similar. I have decided that when the results are way off to clean everything go have a cup of tea and start again.
    Tests today
    Temp 22 c
    Fc 3.4
    pH 7.9
    TA 116
    Cya 76

    I am now going to add chemicals. Thanks for your help.
    Living in Cyprus
    In ground overflow pool tiled 12m X 4m 19507 Us gals 16243 Imp gals
    1 Kw motor 15 cu m per min Sand filter
    I thought I saw the light at the end of the tunnel but it was just some PERSON with a torch walking toward me.
    I started out in life with nothing and I still have most of it left.

  6. Back To Top    #6
    Mod Squad jblizzle's Avatar
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    Re: TA

    And this is why we do not like to trust digital testers.
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    Patrick_B's Avatar
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    Re: TA

    Indeed, digital testing equipment that is reliable is far too expensive to be practical for the average pool owner, and quite unwarranted. Simple titrations are more than adequate, and very dependable.
    TFP Moderator
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