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Thread: Chasing pH

  1. Back To Top    #1

    Join Date
    Nov 2016
    Location
    Las Vegas NV
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    35

    Chasing pH

    After finding this site, took over pool care myself. Changed water 3 weeks ago, and dialed the water chemistry right in using info from this forum and Pool Math.
    One issue...I have to keep adding acid to keep pH down to just 7.5. Have targeted 7.3, but have not gotten there even though seeming to be adding a lot of acid.
    Details:
    Pool unused now. In-ground cement. Covered with blanket. Water temp mid 70's. Filtration run 4hrs/day with waterfall spa overflow. Water very clear, no algae, etc.
    Typical values last 3 weeks: pH=7.5-7.6, Cl=5+, CH=450, TA=110, CYA=50, FC=5, CC=0, TC=5.

    Chlorine has held pretty constant...only 4qts of 8-10% added over last 3 weeks (after the initial dosing)
    CH is high, but that is from the city water source here.

    Have been using KleenStrip muriatic acid. Best estimate from web MSDS is that it is 20% acid.
    Have added 6 qts of acid over last 3 weeks. Additions usually bring pH to about 7.4 (I use Pool Math to target 7.3), but a day or two later, pH is up to 7.5+ again.

    Am I just not adding enough acid? For an unused pool with pretty stable chemistry, does the rate or acid use seem out of line? Is the aeration a contributor to increasing pH issue as some posts indicate?

    As always, thanks much.
    DanL, Las Vegas NV
    IG, 2009, 15kGal, 1.5kGal overflow spa, plaster, Pentair system, 420 cartridge filter, Intelliflow 4-160 main pump, Whisperflow feature pump, Poolvergneugen Pool vacuum, liquid chlorine and sometimes pucks, TF-100 test kit, city water autofill, gas heater, Aquatherm Ecosun solar 480sqft, EZ Touch panel with remote, system: Trouble Free Pool

  2. Back To Top    #2
    Mod Squad pooldv's Avatar
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    Re: Chasing pH

    I would let your ph sit at 7.8 and lower it to 7.6 when it gets to 8.0. The spa overflow is driving pH up through aeration. If you run it less the pH will go up less. Also, TA at 110 will push PH up. Adding acid to lower PH will slowly lower TA too. Or you can actively lower TA following this, Pool School - Lower Total Alkalinity. TA down between 70-80 will slow your pH rise quite a bit.
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  3. Back To Top    #3

    Join Date
    Jun 2015
    Location
    Mandeville, LA
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    Re: Chasing pH

    Why are you trying to target such a low PH? Follow the advise above.

  4. Back To Top    #4

    Join Date
    Nov 2016
    Location
    Las Vegas NV
    Posts
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    Re: Chasing pH

    Quote Originally Posted by WyattEarp View Post
    Why are you trying to target such a low PH? Follow the advise above.
    Hey Wyatt,
    I am exactly trying to follow the advice above. Trying to get TA below 100 and doing that by just what the link explains. Getting to pH 7 - 7.2 is part of the process.
    DanL, Las Vegas NV
    IG, 2009, 15kGal, 1.5kGal overflow spa, plaster, Pentair system, 420 cartridge filter, Intelliflow 4-160 main pump, Whisperflow feature pump, Poolvergneugen Pool vacuum, liquid chlorine and sometimes pucks, TF-100 test kit, city water autofill, gas heater, Aquatherm Ecosun solar 480sqft, EZ Touch panel with remote, system: Trouble Free Pool

  5. Back To Top    #5

    Join Date
    Jun 2015
    Location
    Mandeville, LA
    Posts
    109

    Re: Chasing pH

    Good deal. Once you get that TA down the PH rise should get better

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