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Thread: pH and TA

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    pH and TA

    Our pH tended to be on the lower side in the beginning of the season, but it has been creeping up.

    (What is causing it to creep up? We've really only been swimming a few times - have had lots of rain though, so I guess that could be it, the aeration.)

    pH - 7.7
    TA - 80/90
    FC: 5
    CYA: 40

    If it were your pool, would you do anything regarding the pH on the higher side of normal and the TA on the lower side? If I raise the total alkalinity, it would raise my pH, right? That's not what I would want to do. Or would you leave it be for now? I'll probably have to lower the pH at some point, I'm thinking.

    Pool is crystal clear and want to make sure it stays that way .
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    Mod Squad woodyp's Avatar
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    Re: pH and TA

    I'd hit it with some muriatic acid and blame it on the rain aeration action. I know it raises mine. Your TA looks good.
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    Re: pH and TA

    Quote Originally Posted by woodyp
    I'd hit it with some muriatic acid and blame it on the rain aeration action. I know it raises mine. Your TA looks good.
    I know MA is better, but I only have pH Down (dry acid) on hand. Where would you bring your pH down to, 7.5./7.6, or lower?
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    Richard320's Avatar
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    Re: pH and TA

    I don't let my pH bounce between 7.2 and 7.8 if I can help it. If it's going up, I lower it. Even if it's just a small adjustment. I've got the results right in front of me, it's another thirty seconds to toss a cup of acid in. I figure it buys some breathing room. If I get lazy about testing, I still know it's not too far out of whack.
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    Re: pH and TA

    Okay, since I used dry acid, it did bring my TA down a bit to about 70, with my pH now at 7.5. (I may need to recalculate the size of my pool because my pH decreased slightly more than I anticipated, as did the TA obviously)

    Is my TA still okay, or should I make adjustments to that now as well with some baking soda? I was just going to leave it be and keep my eye on it for a while to see what happens but wanted to ask you guys here.

    I feel like I had read on here or somewhere that if your pool is happy, let your TA be (unless it's really high or low I would assume). Is this correct?
    7+ years, inground, 25,000 gallon, vinyl, sand filter.

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    JasonLion's Avatar
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    Re: pH and TA

    TA at 70 is fine.
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    Re: pH and TA

    Thank you Jason. Wanted to make sure. I know the range is 70 - 90+ but I'm not used to it being this low
    7+ years, inground, 25,000 gallon, vinyl, sand filter.

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    Re: pH and TA for those who use dry acid

    Okay guys...I'm back with a similar situation. (This may be the ongoing situation for the rest of the season I feel.)

    This is for those who use dry acid vs. MA when lowering pH:

    I used some dry acid when I posted last, which brought my TA down from 80 to 70. My pH was looking good at 7.5.

    Now, my pH is creeping up again (about 7.6/7.7, never can tell) (lots of swimming now), and I know I'll be finding myself adding some acid soon. However, with my TA of now 70, what do you guys who use dry acid do? I really don't want the TA to get much lower. I don't want to use MA. It's me primarily taking care of the pool since my husband's work schedule is crazy. If he was taking care of it, yeah, I may have him use it, but I'm def not

    So, with my pH of say 7.7, TA of 70, what are my options (aside from using MA)?

    FC: 4
    pH: 7.6/7.7
    TA: 70
    CYA: 40

    Should I start raising the TA a little first, while pH is still looking okay, and then shoot for the pH after the TA looks better?
    7+ years, inground, 25,000 gallon, vinyl, sand filter.

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    Re: pH and TA

    I think you are a little confused. Acid lowers pH and TA. Doesn't matter the source, liquid or dry, it lowers TA. So if your pH is rising just add acid, doesn't really matter which. The biggest difference between muriatic acid and dry acid is price. You get way more from a gallon of MA than from a bottle of dry acid, but they both lower TA and pH.

    I personally don't worry too much about TA, if it drops a bit more from there I don't think it will have any real negative effects.
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    Re: pH and TA

    Quote Originally Posted by Donldson
    I think you are a little confused. Acid lowers pH and TA. Doesn't matter the source, liquid or dry, it lowers TA. So if your pH is rising just add acid, doesn't really matter which. The biggest difference between muriatic acid and dry acid is price. You get way more from a gallon of MA than from a bottle of dry acid, but they both lower TA and pH.

    I personally don't worry too much about TA, if it drops a bit more from there I don't think it will have any real negative effects.
    Oh, I'm so sorry for the confusion! I feel like an idiot right now

    Thank you for the reassurance regarding the TA. BTW, for a chlorine pool, regarding TA, what range would you say would be cause for concern and requires a necessary adjustment? I know all pools are different but just wondering so I have an idea when I should really look out for it. Thanks!
    7+ years, inground, 25,000 gallon, vinyl, sand filter.

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    Re: pH and TA

    First, don't feel like an idiot. You don't know what you don't know, but now you know what you know

    I really don't know what level I would worry about TA, I have never had it drop to any extreme and I haven't added baking soda or washing soda in years. I would say add the acid to keep your pH in check and see what happens to the TA. If you start getting some wild pH swings or someone else comments with more experience in this area then you can make some changes from there if you need to.
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    Re: pH and TA

    TA at 60 is fine, below that is not so good in the long run, but won't cause a problem for a couple of days.
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    Re: pH and TA

    Thanks guys!
    7+ years, inground, 25,000 gallon, vinyl, sand filter.

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