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Thread: Low TA, stable pH

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    Low TA, stable pH

    Greetings! I'm looking for a little reassurance here. My pool has always had the following battles as I live in the desert with hard, hard water.

    Rising pH, approx. .2-.3 per day and of course, calcium hardness-Bad combination for scaling!

    To combat, I drain my pool as often as I can and keep my TA down at 60. In addition, I use trichloro pucks to assist with pH. Still need to feed my pool acid 3x per week, taking it down to 7.1-7.2 with each addition. Recently, I had a pool company take over the reins as I had foot surgery. I made the tech aware of my pools acid habit and requested that he add to 7.2 each visit (2x per week) The first week he completely overshoot, taking my pool down to approx. 6.4-6.5 both times. I was mortified! Here are the results:

    CH 375
    TA 40
    pH 7.5
    TC 6.5
    CC 0.5
    FC 6
    CYA 30

    The low TA is giving me a CSI of -0.4 with a temp of 72 degrees...in the danger zone. This will only get better as my CH rises. But for the first time, the pH appears stable. If this continues, can I assume my pool likes a TA of 40 and not worry about it being too low?

    Thanks for the help!
    10 x 26 IG gunite/plaster
    7300 Gallons
    Hayward Tristar single speed 1 HP
    Hayward CF C4025
    Pool DOB 1/10

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    Mod Squad jblizzle's Avatar
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    Re: Low TA, stable pH

    What was the pH previously rising too? I think you were trying to maintain the pH too low.
    At low pH it rises faster. Is there a chance the pool would have stabilized at a pH of 7.8 which would have been fine?

    That TA and CSI is a little on the low side for my liking.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Low TA, stable pH

    Jason
    I tried that approach, but the pH kept rising .2-.3 daily. When it hit 8.2, I realized that wasn't the answer. I drained the pool approx. one month ago, which is why the current CH isn't bad, but it's only a matter of a few months that it will be 500+

    I will continue to track the TA and pH, I don't plan on adding acid until it hits 7.8. My experience with this pool says that by the TA will most likely rise a bit in the meantime. Maybe it can find a happy place at 50
    10 x 26 IG gunite/plaster
    7300 Gallons
    Hayward Tristar single speed 1 HP
    Hayward CF C4025
    Pool DOB 1/10

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    Mod Squad jblizzle's Avatar
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    May 2010
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    37,389

    Re: Low TA, stable pH

    You could also try adding borates to stabilize the pH as well.
    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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