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Thread: pH always rising

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    pH always rising

    I'm at the point now where I have to add dry acid every week or so because of my climbing pH, even when there hasn't been a lot of swimming going on lately (not too much rain either).

    Our TA has been pretty steady around 70. I just lowered pH from 7.7 to 7.5/7.6 the other day.

    In the early season, when TA was about 100, our pH was stable, but then again, not much swimming going on at all then.

    Is this a normal occurrence to have to lower pH in the mid-to-end of the season, weekly? I'm now wondering if my rising pH has anything to do with my low TA and wondering if I need to correct TA at some point in order for pH to remain more stable??

    TA: 70
    PH: 7.5/7.6
    FC: 4
    7+ years, inground, 25,000 gallon, vinyl, sand filter.

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    Patrick_B's Avatar
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    Re: pH always rising

    Most pools tend to rise, perfectly normal. Do you have a salt pool? Im guessing no, but your sig doesn't say. Do you have water features? Both will speed pH increase. TA 70 isn't bad either. I do encourage you to use Muriatic acid versus dry. Dry acid used long term can contribute more sulfates to your pool. We are all about adding things with the least amount of side effects possible.
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    Re: pH always rising

    Quote Originally Posted by Brushpup
    Most pools tend to rise, perfectly normal. Do you have a salt pool? Im guessing no, but your sig doesn't say. Do you have water features? Both will speed pH increase. TA 70 isn't bad either. I do encourage you to use Muriatic acid versus dry. Dry acid used long term can contribute more sulfates to your pool. We are all about adding things with the least amount of side effects possible.
    You're right. I didn't notice that I didn't put that I have a chlorine pool. No water features. I could understand why it was increasing when we were swimming a lot, but not sure why lately, when there hasn't been much aeration.

    I'll just leave the TA alone and continue to add acid when necessary. Thanks for the reassurance
    7+ years, inground, 25,000 gallon, vinyl, sand filter.

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    Re: pH always rising

    If the pool water is warmer, then the rate of outgassing is somewhat faster.
    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
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    Smykowski's Avatar
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    Re: pH always rising

    As long as CSI isn't an issue, you could let it drift up to 7.7 or 7.8 and see if it settles there.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
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    Patrick_B's Avatar
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    Re: pH always rising

    Just so you know, a salt pool is also a chlorine pool as the salt is converted to Chlorine. Just stay on it and you'll be fine. 7.5-7.6 is great if tou ask me.
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