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Thread: When to Address Dropping TA Levels?

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    When to Address Dropping TA Levels?

    Following a water change-out in January to address a nasty CYA issue, I have had a nice chemistry balance that I've been able to maintain using only bleach, muriatic acid and a weekly scrub-down. However, on the most recent test I noticed my TA is now down to 70 ppm. (It's been drifting down from 100 since the change-out.) Is it time to act on that, or can I left it drift lower? If so, at what point do I need to act? Here's my latest data:

    FC 3.8
    CC 0
    pH 7.4
    TA 70
    CH 225
    CYA 45

    Thanks in advance for the advice!
    26K gal, IG Pebble Tec, 2 HP Jandy Pump, 420 sqft filter (Durex Triton C&C Plus with 4 PCC105 Pleatco filters), Barracuda G3 Vacuum, build date unknown, using Taylor K-2006 Test Kit.

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    Mod Squad jblizzle's Avatar
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    Re: When to Address Dropping TA Levels?

    A TA of 70ppm is fine, it should not really go below 60ppm.
    What are you adding to make the TA drop? This is usually only a problem if you are using an acidic chlorine source.
    Jason, TFP Moderator
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    Richard320's Avatar
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    Re: When to Address Dropping TA Levels?

    I run my pool about 70 TA most of the time. Once you start losing a lot of water to evaporation and start refilling, your TA might actually start climbing again.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: When to Address Dropping TA Levels?

    Thanks for the responses guys!

    Richard -- I think you are right... My tap water TA is 90 and it's starting to warm up, so a rebound is highly likely.

    Jason -- the only two products I have been adding to my pool since the January change-out are KEMTEK chlorinating liquid (10% sodium hypochlorite) and KEMTEK muriatic acid (14.5% hydrogen chloride). Is that an acidic chlorine source? Should I be switching to something else, or balancing it somehow?
    26K gal, IG Pebble Tec, 2 HP Jandy Pump, 420 sqft filter (Durex Triton C&C Plus with 4 PCC105 Pleatco filters), Barracuda G3 Vacuum, build date unknown, using Taylor K-2006 Test Kit.

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    Richard320's Avatar
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    Re: When to Address Dropping TA Levels?

    The Kemtek HCl is Muriatic Acid aka Hydrochloric acid. You're buying the half-strength stuff and paying for a lot of water. You ought to look around and see if you can't find some stronger stuff.

    I buy 12.5% chlorine and 31.45% acid in refillable bottles. You have to buy the stuff in multiples of 4, but they'll usually mix-n-match, 3&1 or 2&2. Once you pay the deposit, it's quite reasonable. See if you have a dealer nearby. http://www.hasapool.com/dealer_locator_hasa.php If you've ever seen a pool service truck with orange or yellow milk crates in the back, that's the stuff.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    jcowart's Avatar
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    Re: When to Address Dropping TA Levels?

    I would not really sweat the TA. Like what was noted I would not let it get below say 60. I don't see a SWG in your sig, are you fighting pH swings? Usually once the pH is lined out the TA will be at it's happy home. Every pool is a little different. Do you have a suction side leak. I have seen a leak not show up until the pump was running. It was enough to draw air in and keep driving the pH up and in turn drive the TA down because of the MA that was used to keep it in check.
    17500 gallon Doughboy AGP, Hayward DE filter, waiting for the 1.5hp DB pump to go out.
    Learn to take the advice here and be trouble free or use the pool store's advice. "You can't do both and get very far"

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    Re: When to Address Dropping TA Levels?

    Thanks for the tip Richard! I found a dealer not too far from my work... Been stopping at the local hardware store since its on the way home, but it looks like it'd be worth my while to start taking the occasional detour.

    Jcowart -- I'm not sure if I'm 'fighting' pH swings (although I can tell you I'm not SWG)... My pH goes up a little less than 0.1 every day, so every two days I'm adding a bit of acid to keep things between 7.4 and 7.6. I previously posted an inquiry about this and most responses indicated that this is a normal state of affairs. That being said, I do have an issue with my pump which may be a suction side leak... I am very new to this and know little about pumps. However, I can tell you that after the pump shuts off, I can hear things gurgling -- it sounds like air getting into the system. Then when the pump goes on, it takes a couple of minutes to build up pressure and get a good flow going. (After that it runs just fine.) Is it possible that's part of what's driving up my pH? Should I be getting the pump serviced?
    26K gal, IG Pebble Tec, 2 HP Jandy Pump, 420 sqft filter (Durex Triton C&C Plus with 4 PCC105 Pleatco filters), Barracuda G3 Vacuum, build date unknown, using Taylor K-2006 Test Kit.

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    Mod Squad jblizzle's Avatar
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    Re: When to Address Dropping TA Levels?

    Hearing air gurgling when the pump is off could be a leak anywhere in the equipment. This should definitely not be happening and is the reason the pump must re-prime every time.

    Do you see water leaking out anywhere when the pump is on?
    Can you try to isolate where you are hearing the noise, or maybe be able to hear the air hissing as it is sucked in.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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