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Thread: Ph OF THE POOL WATER

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    Ph OF THE POOL WATER

    Asking for some ideas.

    We have a concrete salt water pool; the ph normally tests above 8.2 and while i can adjust it to the 7.2-7.5 range with muriatic acid, the adjustment is short lived. Within 2-3 days it has climbed back up again. Other test results using the t-100 kit are: Chlorine 3-4 ppm, ca-275, cya-60-65, total alk -180.

    So i have 2 questions: Why does the ph keep rising? Should i use some other acid to try lowering the ph?

    Thanks.

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    Mod Squad tim5055's Avatar
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    Re: Ph OF THE POOL WATER

    Welcome to TFP!

    A little more description on your pool would help. Age, equipment, waterfalls, things like that.

    pH rise is caused by curing plaster and aeration caused by water movement. A busy waterfall or a newer plaster pool could be the cause.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Divin Dave's Avatar
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    Re: Ph OF THE POOL WATER

    Hi Jimmicco,

    your pH keeps rising because your TA of 180 is way too high.
    If your plaster is new, then curing of the plaster can also add to it.
    The TA controls the rate of how fast pH rises. Lowering it to within TFP recommended levels will help slow it down.
    Pool School - Recommended Levels

    Muriatic Acid is the best chemical to lower the pH.

    Here is how to lower TA
    How to lower TA
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
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    Re: Ph OF THE POOL WATER

    Welcome to the forum.

    As you read more and more on the forum. You will find that almost ALL pools have a tendency for rising pH and Salt pools are especially prone to that.

    That said, if you lower your TA, you will find your pH will probably become much more manageable.

    Lowering TA is done with acid AND AERATION, It is a process that may take a few days but will be worth it. There is an article in Pool School that will explain the process and we'll help if your have question.

    read "The ABC's of Pool Water Chemistry" up in Pool School before you start the TA process.......it'll help with the basics you need.

    Muriatic acid is the single best way to control your pH, incidentally........don't use anything else.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Ph OF THE POOL WATER

    The pool was installed in 2006 and holds approximately 13,500 gallons. There are 4 return jets in each corner of the pool. There are no waterfalls. One skimmer. Solar heated but that has been off for the summer

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    Re: Ph OF THE POOL WATER

    It's mostly the high TA level then. The aeration from the saltwater chlorine generator combined with the high TA leads to pH rise. Also, if your piping from the SWG unit to the pool return is relatively short, then you can also have chlorine gas outgassing and should consider pointing the return a little down to give the chlorine more time to dissolve into the water. First though, I'd lower the TA significantly and see how that goes.
    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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    Re: Ph OF THE POOL WATER

    lower pH with acid, aerate constantly to raise the pH up again so you can add more acid, more often.
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