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Thread: Ph constantly on the rise!

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    Join Date
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    Dallas Ft. Worth
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    Ph constantly on the rise!

    Hi everyone! This is my first post so hope I do this right!
    My pools PH rises so frequently that I am adding about 64oz muriatic acid every 2 or 3 days. After reading everything I can find on this site about rising PH, I'm guessing it might be due to aeration rather that chemistry (maybe). We use our Riverflow pump two hours a day, which causes the entire 22K pool to circulate for two hours. Also, because of many crape myrtles, high temperature (100's) and high water temp (92) I've been running the pump 24/7 at 1400 rpm, IntelliChlor at 20%. This keeps the pool sparkling at all times but I feel like I can't go away for 2 weeks because who knows how high the PH will be when I get back! So my questions are these:
    Is the PH rise caused by aeration? If so, is there an automatic muriatic acid dispenser I can add to the pool system?
    Would adding Borates help? I almost added them after reading those threads but thought I'd check with the experts first!

    Current TF-100 test results:
    FC 6.5 (high today; usually keep at 5)
    CC 0
    PH 7.8 (might be higher; don't have a PH meter yet)
    TA 70
    CH 260
    CYA 60
    Thanks so much for your help!
    22K gal, 20x30 IG, Stonescapes finish
    IntelliChlor IC40 SWG
    Pentair Intelliflow, Cartridge filter
    Additional Riverflow Elite swim pump
    Polaris 280

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    svenpup's Avatar
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    Re: Ph constantly on the rise!

    Your rising pH is caused by aeration (from the SWG as well as other water movement) AND chemistry: specifically TA.

    There are a few things you can try. First of all, you can add CYA up to 80 ppm which should allow you to reduce you SWG run time/percentage.

    Also, you can add borates AND bring TA down to 50-60. Adding borates allows you to run a lower TA which will help you slow the pH rise.
    TFP Method Advanced Intermediate
    • 17,500 gallons - In Ground - Plaster - Hayward Swimclear 3020 Cartridge Filter - Sta-Rite Max-E-Glas Main Pump upgraded with A.O. Smith B2980 E-Plus New Centurion Two-Speed Motor - Polaris 280 Cleaner with Polaris PB4-60 Booster Pump - TightWatt2 Timer - Taylor K-2006 Test Kit - Pool Pilot Digital Nano SWCG

    Helpful Links: Pool School, BBB for Beginners, How to Shock (hint...it's a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

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    JasonLion's Avatar
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    Re: Ph constantly on the rise!

    If your pool is less than one year old the plaster curing will also contribute to the PH rising.
    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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    benavidescj's Avatar
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    Re: Ph constantly on the rise!

    grannyswimz, I have a new pool and a SWG. I am adding about 1 gallon of bleach a week. Just letting you know you are not alone with your issue. I have borates at 50 ppm and keep my TA around 70 ppm. My CYA is about 70 ppm. I am hoping my rising pH is related to my pool being new, about 4 months old. I am pretty sure I will always have some rise in pH due to my SWG and am investing in an automated acid dispenser.
    Carlos
    Pool: 28,000 gallons IG; IC 40 SWG; Pentair 120 gpm cartridge filter; Marble finish; Pentair Wisperflow 1.5 hp; Polaris 360
    Spa: 350 gallon; Bromine
    How to shock your pool

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    Re: Ph constantly on the rise!

    Thanks everyone. Our pool is 8 months old and was drained and acid washed 2 months ago due to minor finish flaws. So maybe this is just a curing issue. In the meantime I'll investigate automated dispensers (Carlos, thanks for letting me know they exist). After the pool was refilled I did all the chems myself according to TFP. Checked my results with Leslies and lady said "You balanced all this perfectly yourself?" Three cheers for TFP!!
    22K gal, 20x30 IG, Stonescapes finish
    IntelliChlor IC40 SWG
    Pentair Intelliflow, Cartridge filter
    Additional Riverflow Elite swim pump
    Polaris 280

  6. Back To Top    #6

    Re: Ph constantly on the rise!

    My fill water is 340 TA so if I am adding water, I need to add MA to reduce pH. Test your fill water, you may find that it will be a constant battle, so just get used to it.

    A jug of bleach, 1 - 2 cups of acid, every other day, pretty much.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

  7. Back To Top    #7

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    Re: Ph constantly on the rise!

    Never thought to check the TA of the fill water (duh!). With this heat we're adding lots of water every 3 days. Thanks for the tip. Also looks like I'll be adding borates to help too. Time to reread those threads!
    22K gal, 20x30 IG, Stonescapes finish
    IntelliChlor IC40 SWG
    Pentair Intelliflow, Cartridge filter
    Additional Riverflow Elite swim pump
    Polaris 280

  8. Back To Top    #8

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    Houston, TX
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    Re: Ph constantly on the rise!

    I'm in the same boat but have a bit of a different question. If one is constantly battling high pH due to aeration and with this adding a lot of muriatic acid wouldn't this result in a TA that is too low eventually?
    1) 15000 Gallons Gunite
    2) Sand
    3) In Ground
    4) Pentair Intelliflo VS
    5) SWG

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    JasonLion's Avatar
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    Re: Ph constantly on the rise!

    eric99gt, yes, eventually. Usually it takes quite a while for the TA to come down, but eventually it will get too low.
    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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