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Thread: TA and pH

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    TA and pH

    Hello. My pool was completed the first week of June. I knew I would have trouble keeping pH balanced and I was right. I have to add acid at least every other day. At first I had a TA of 120 and I worked to lower it. Now it is at 70, sometimes reads 60. Every other day or so my pH is at least 8.2. I add the acid at the appropriate amount and my pH stabilizes for the day. My question is do I need to raise the TA a little bit? Will that help keep my pH stable a little longer or is it only a high TA that affects pH rebounding? Or will I just have to accept the nearly daily battle with pH and acid?
    Other test results-
    FC- 5 first thing in the morning, (dosed with stenner overnight)
    Cya- 35 to 40
    CH- 350

    Did I miss something?

    Thanks in advance!
    Andrea
    35,000 gallon, IG pebble finish, cartridge filter, Pentair variable speed pump, Stenner chlorine pump, Dolphin Oasis Z5 cleaner, Spa, Slide and waterfall, construction complete June 1, 2014, TF-100 test kit, pool filled with Central Texas well water(very hard water)

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    Join Date
    Jul 2014
    Location
    Prospect Heights, IL (NW Chicago)
    Posts
    64

    Re: TA and pH

    The general rule is "If your PH is consistently high, then lower your TA. If your PH is consistently low, then raise your TA."

    Do you have a lot of sources of aeration that could be causing the PH increase? Any spillovers, fountains, waterfalls, etc?
    40x20 IG gunite (~36K gallon). 6' attached spa with spillover. AquaLink RS OneTouch + SpaLink + iAquaLink 2.0
    450 sqft Sta-Rite cartridge filter, Sta-Rite single speed pumps (main, spa jets, booster)
    Coverstar Auto Cover, Polaris 280 cleaner, Taylor K-2006

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    Re: TA and pH

    Yes! Lots of sources of aeration. Waterfall, spillway, slide, bubblers in beach and kids, dog and other swimmers. I haven't noticed any connection to those considerations being out of the equation and a more stable pH though. How in the world does my TA stay so low? It isn't as susceptible to change I guess?
    35,000 gallon, IG pebble finish, cartridge filter, Pentair variable speed pump, Stenner chlorine pump, Dolphin Oasis Z5 cleaner, Spa, Slide and waterfall, construction complete June 1, 2014, TF-100 test kit, pool filled with Central Texas well water(very hard water)

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    37,879

    Re: TA and pH

    PH increases come from paster curing and from high TA. If you raised TA, the reduced PH drift from plaster curing due to the higher TA would be more than canceled out by the increase PH drift from higher TA.
    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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    Re: TA and pH

    Ha. Ok, Jason got it. I should do nothing then. Wait for plaster to finish doing what it's got to do I suppose?
    35,000 gallon, IG pebble finish, cartridge filter, Pentair variable speed pump, Stenner chlorine pump, Dolphin Oasis Z5 cleaner, Spa, Slide and waterfall, construction complete June 1, 2014, TF-100 test kit, pool filled with Central Texas well water(very hard water)

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    wjr75's Avatar
    Join Date
    Jun 2013
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    IL
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    816

    Re: TA and pH

    I just replied to another post about this. I had a new Pebble Sheen finish applied two months ago and went through 4.5 gallons of muriatic acid thus far. The first week taking a half gallon every other day with a TA around 110. I'm now down to only a 1/8 of a gallon every few days. I also have a slide that has water that aerates the pool some what.
    Inground 22k gallon gunite 15x31 main pool, 15x7 wading pool/sunning deck, hot tub/with overflow (9' octagon with limestone top) & slide NSWG, Aqua Blue Pebble Sheen
    Filter dual cartridge Sta-rite 450sq/ft, TF-100 Test Kit
    Heater Raypak 2100 400k btu cupro-nickel exchanger
    Auto pool cover, Polaris 280 auto pool cleaner, Jandy AqualinkRS8 Remote Control System

  7. Back To Top    #7

    Re: TA and pH

    I have a pebble finish as well. Filled pool first weekend of June. I've been through more acid than that (maybe 6 gallons?). At first my goal was to lower my TA so I added enough acid to get a pH of 7.2 and then my pool pal app said to aerate to get pH back to 7.6. I did that until my TA dropped so much. Now I'm in a daily battle to keep pH below 8.0. Frustrating and I hate handling that acid so often. Anyways, at least my bleach is automated! I'll keep hoping that things will level off a bit. Thanks for the advice y'all!
    35,000 gallon, IG pebble finish, cartridge filter, Pentair variable speed pump, Stenner chlorine pump, Dolphin Oasis Z5 cleaner, Spa, Slide and waterfall, construction complete June 1, 2014, TF-100 test kit, pool filled with Central Texas well water(very hard water)

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    Join Date
    Jun 2014
    Location
    The Woodlands, TX
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    167

    Re: TA and pH

    Quote Originally Posted by alright_alright_alright View Post
    I have a pebble finish as well. Filled pool first weekend of June. I've been through more acid than that (maybe 6 gallons?). At first my goal was to lower my TA so I added enough acid to get a pH of 7.2 and then my pool pal app said to aerate to get pH back to 7.6. I did that until my TA dropped so much. Now I'm in a daily battle to keep pH below 8.0. Frustrating and I hate handling that acid so often. Anyways, at least my bleach is automated! I'll keep hoping that things will level off a bit. Thanks for the advice y'all!


    This is the same problem I am having and posted about in another thread. My pebble finish was also done in June. Could be still simply curing? Good to know.


    8,000 gallon in-ground gunnite geometric. Wet Edge Satin Matrix. Triple overflow water feature.
    Hayward - TCell 15 SWG; TriStar VS Main Pump; SwimClear 425 Cartridge Filter; ProLogic 4 Automation, SuperII Water Feature Pump; Polaris 280 w/ Booster
    Link to my Build

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    wjr75's Avatar
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    Jun 2013
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    IL
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    816

    Re: TA and pH

    The pebble tech guy told me most of the curing is done the first three months.
    Inground 22k gallon gunite 15x31 main pool, 15x7 wading pool/sunning deck, hot tub/with overflow (9' octagon with limestone top) & slide NSWG, Aqua Blue Pebble Sheen
    Filter dual cartridge Sta-rite 450sq/ft, TF-100 Test Kit
    Heater Raypak 2100 400k btu cupro-nickel exchanger
    Auto pool cover, Polaris 280 auto pool cleaner, Jandy AqualinkRS8 Remote Control System

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    Join Date
    Oct 2013
    Location
    Oklahoma
    Posts
    50

    Re: TA and pH

    We finished our pebble tec finish in February and have the same problem as you. Maybe not quite as intense. Adding 16-32 oz per week of muriatic acid. Waterfall runs about an hour per day. TA near 60.


    13000 gallon pool, SWG, DE Filter, 2 sheer descent waterfalls, built Jan 2014

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