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Thread: PH climbing daily by .3

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    SunMan's Avatar
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    PH climbing daily by .3

    Still fairly new to pool school, but my water is brilliant and I no longer am dealing with the idiots at the pool store My concern is that my PH is climbing daily by .3ppm, so every 3 days I'm adding about a quart of 31% muriatic acid. I daily replenish my chlorine with about 20-28 oz of liquid @12.5%. I would like to find a way to stabilize the PH. Any thoughts?
    BTW, over the past 30 days my CA has gone from 50-60.
    Test results:
    FC 6
    PH 7.8
    TA 80
    CH 300
    CYA 60
    CC 0
    Salt 1825 for feel
    Shasta 10,500 gallon play pool/spa, pebble tech finish (10/12), in floor cleaning, 2' free-fall, deck jets, Hayward 2hp SP3400VSP pump, Jandy 8 cartridge filter, LX heater and AquaLink Sunny Phoenix, AZ

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    Mod Squad jblizzle's Avatar
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    Re: PH climbing daily by .3

    Do you have any aeration like a waterfall, spill-over, etc? That can drive the pH up.

    The way to slow the rise is to lower the TA. This can eiterh be done passively by keeping the pH in range and the TA will slowly drop, or more aggressively following the article in Pool School.
    Jason, TFP Moderator
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    SunMan's Avatar
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    Re: PH climbing daily by .3

    I have a 2' high waterfall which is seldom used and there is a spillover from the spa with only a 1"drop. So now I am confused because the pool calculator tells me to aerate to lower my TA (which I thought was fine to start with since it is in the suggested 70-90+ range).
    Shasta 10,500 gallon play pool/spa, pebble tech finish (10/12), in floor cleaning, 2' free-fall, deck jets, Hayward 2hp SP3400VSP pump, Jandy 8 cartridge filter, LX heater and AquaLink Sunny Phoenix, AZ

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    Re: PH climbing daily by .3

    Lowering TA is a process. You add Muriatic Acid to lower the pH and TA, and then aerate to raise the pH back up. You repeat the process until your TA is at the desired level. Aerating, by itself, doesn't lower TA at all.
    John
    7 year old ~13,500 gal 24' AGP with 1.5 hp Proline pump, 150 sqft Pleatco cartridge, filled with well water with pH of about 4.5.
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    linen's Avatar
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    Re: PH climbing daily by .3

    Do you run your deck jets a lot? They will raise ph very quickly.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    SunMan's Avatar
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    Re: PH climbing daily by .3

    No to the deck jets. Seldom even use the pool except on weekends. Did get the TA down from 140 at refill 30 days ago. I'll just keep working on lowering the TA. Any ideas where the raise in CYA came from? Muriatic acid perhaps?
    Shasta 10,500 gallon play pool/spa, pebble tech finish (10/12), in floor cleaning, 2' free-fall, deck jets, Hayward 2hp SP3400VSP pump, Jandy 8 cartridge filter, LX heater and AquaLink Sunny Phoenix, AZ

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    Re: PH climbing daily by .3

    CYA only goes up when you add products which contain CYA, typically trichlor tablets, or granular dichlor. Muriatic acid does not contain any CYA.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    linen's Avatar
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    Re: PH climbing daily by .3

    When you add cya by using granular stabilizer, it can take up to a week to show up in tests after it disappears into the water.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    SunMan's Avatar
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    Re: PH climbing daily by .3

    The only thing I have put in my pool since I started reading this forum is liquid chlorine, salt and muriatic acid. So the CYA remains a mystery.
    Shasta 10,500 gallon play pool/spa, pebble tech finish (10/12), in floor cleaning, 2' free-fall, deck jets, Hayward 2hp SP3400VSP pump, Jandy 8 cartridge filter, LX heater and AquaLink Sunny Phoenix, AZ

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    Re: PH climbing daily by .3

    CYA readings increasing by 10 without the addition of any CYA during that time is testing variance. That's all it is.

    Your plaster is less than a year old, right? It is still curing and therefore, your acid demand will continue to be high. You can lower your TA somewhat, but you will still need to add acid fairly frequently and in good amounts because you have new plaster.

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    Re: PH climbing daily by .3

    So the CYA remains a mystery.
    The margin of error in that test is easily 10 ppm. As said before, CYA only increases in your pool if you add it.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    SunMan's Avatar
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    Re: PH climbing daily by .3

    Thanks Weatherby for the insight on the plaster cure. I also can accept the test variance for the cya being user error. I think I'll just hold my TA at the low end of the recommendation and wait out the PH rise with MA Thanks again to all who responded!
    Shasta 10,500 gallon play pool/spa, pebble tech finish (10/12), in floor cleaning, 2' free-fall, deck jets, Hayward 2hp SP3400VSP pump, Jandy 8 cartridge filter, LX heater and AquaLink Sunny Phoenix, AZ

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