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Thread: pH keeps going up

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    tlwilson's Avatar
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    pH keeps going up

    I have been using Liquid Chlorine 12.5% from Menards and notice that pH keeps going right back up after I bring it down. I use Muriatic Acid in amounts according to the Pool Calculator and usually bring it down to 7.4, then within a day or so it is right back up to 7.8 or even 8.0. Alk has been as high as 150, but has been 120 for a while now. My water is sparkling, crystal clear and beautiful. Should I bring pH down to 7.2 and then aerate to bring alk down further? Seems like I read that higher alkalinity makes it harder to keep pH in normal ranges. Am I obsessing about numbers too much? By the way, I love BBB. The only thing I pour in my pool is chlorine and Muriatic Acid.

    FC 4.2
    CC 0.0
    pH 7.8
    Alk 120
    CH 270
    CYA 40
    24,000 Gal In Ground pool
    Vinyl Liner; Sand Filter
    Pentair Intelliflo pump
    Pentair IntelliChlor IC40 SWG
    Raypak Gas Heater

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    JasonLion's Avatar
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    Re: pH keeps going up

    Lower your TA, or let it come down from the acid used to maintain PH, and the rate at which PH rises will slow down and most likely eventually stop. High TA puts pressure on the PH to rise.

    If you have to ask if your are obsessing, then yes you are obsessing. Relax, you are doing just fine and don't need to sweat ever detail.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Mod Squad jblizzle's Avatar
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    Re: pH keeps going up

    Review the lowering TA article in pool school as some of your details were a little off ... aeration does nit lower TA it only raises pH.

    Posted with Tapatalk ... sorry if I sound short ... hate typing on phone
    Jason, TFP Moderator
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    chiefwej's Avatar
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    Re: pH keeps going up

    Quote Originally Posted by jblizzle
    Review the lowering TA article in pool school as some of your details were a little off ... aeration does nit lower TA it only raises pH.

    Posted with Tapatalk ... sorry if I sound short ... hate typing on phone
    But it raises pH without raising TA. So with MA lowering both pH and TA, acid and aeration are the key to lowering the TA.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    Re: pH keeps going up

    Slightly off the subject, but those results say you are not shocking your pool which would require an FC up around 12ppm or so with a CYA of 25ppm.
    Chief makes a great point that is one of my pet peeves. The key to understanding how to PERMANENTLY lower TA is to understand the need for both acid and aeration.

    Thinking of lowering TA simply by adding acid is not the comprehensive way to gain an understanding of the process.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    tlwilson's Avatar
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    Re: pH keeps going up

    Does aeration cool off the water? Being in Nebraska, we don't have warm water yet and we run the gas heater to inch the water up to 80 degrees. I hate to lose heat.

    Also, I don't like handling muratic acid, but like it a lot better at $4 a gal than pool store costs for granules at $20. Is it OK to store in the pool room or does it need to be kept outside?
    24,000 Gal In Ground pool
    Vinyl Liner; Sand Filter
    Pentair Intelliflo pump
    Pentair IntelliChlor IC40 SWG
    Raypak Gas Heater

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    Mod Squad jblizzle's Avatar
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    Re: pH keeps going up

    Yes aeration will have a cooling effect on the water.

    You want to store the acid away from any chlorine (don't want it to mix), in the pool room should be OK although there are some vapors that are given off that can cause corrosion on metal.
    Jason, TFP Moderator
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    Quinsee's Avatar
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    Re: pH keeps going up

    Quote Originally Posted by tlwilson
    Also, I don't like handling muratic acid, but like it a lot better at $4 a gal than pool store costs for granules at $20. Is it OK to store in the pool room or does it need to be kept outside?
    See my sig. You can store it in the pool room as long as it's -AWAY- from any bleach/chlorine.

    edit: Well, I just clicked the link and it seems to be dated. Mixing Muriatic acid (Liquid fully saturated with Chlorine) and Chlorine creates Chlorine gas which turns any water it contacts (mucus membranes) into Hydrochloric Acid. Bad stuff.
    Pool School - Pool Calculator - Chlorine Best Price Calculator - CYA/Chlorine Chart
    24' AGP w/ 48" walls, 13500 gal., 150lb Hayward sand filter, Century 1.5hp pump, South central Indiana
    !!Don't melt your kids!! Muriatic Acid mixed with bleach produces Chlorine gas. KEEP THEM SEPARATED!!

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    tlwilson's Avatar
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    Re: pH keeps going up

    I'll be careful.
    24,000 Gal In Ground pool
    Vinyl Liner; Sand Filter
    Pentair Intelliflo pump
    Pentair IntelliChlor IC40 SWG
    Raypak Gas Heater

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