Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 11 of 11

Thread: Acid dropped ph but not TA

  1. Back To Top    #1

    Acid dropped ph but not TA

    So last night I had TA of 140, ph of 7.8. I added the required acid (72oz into 13.3k gallons) that should of dropped ph to 7.0. This morning sure enough, ph is reading 7.0 but TA is still showing 140. I'm about aerate now to raise ph back up.

    Do I just keep doing this process until TA drops to 90?

    CSI is -0.23 once ph is back up

    Full numbers:

    Ph 7.6 (once I aerate)
    Calcium 300
    TC 9
    FC 0
    TA 140
    Water temp 69
    24' AGP, 54" - 13,300 Gallons at 47".
    AquaRay Cleaner
    Hayward Swimpro Voyager Filter/2 Speed 2 HP Pump

  2. Back To Top    #2

    TFP Guide

    Azgirl71's Avatar
    Join Date
    Apr 2015
    Location
    Sierra Vista, Az
    Posts
    2,586

    Re: Acid dropped ph but not TA

    The TA test can be tricky. Once PH rises again then add more MA and repeat. Is your FC really 0? If do get your FC up.
    Lisa
    Intex AG vinyl 15' x 48" 4,300 gallons due to skimmer install, Krystal Clear SF pump combo 2800 GPH, Krystal Clear SWG, Pool Blaster Max vacuum, Hayward thru the wall skimmer, TF 100 test kit with speed stir, K 1766 Taylor salt test, My SLAM Process

  3. Back To Top    #3

    Re: Acid dropped ph but not TA

    Sorry I reversed those

    FC 9
    24' AGP, 54" - 13,300 Gallons at 47".
    AquaRay Cleaner
    Hayward Swimpro Voyager Filter/2 Speed 2 HP Pump

  4. Back To Top    #4

    Re: Acid dropped ph but not TA

    CC 0
    24' AGP, 54" - 13,300 Gallons at 47".
    AquaRay Cleaner
    Hayward Swimpro Voyager Filter/2 Speed 2 HP Pump

  5. Back To Top    #5
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Acid dropped ph but not TA

    Yes, just keep at it. The TA will go down, though not always by enough to show up on the test in a single step. Over several cycles the small changes will accumulate, and you will eventually get there.
    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

  6. Back To Top    #6

    TFP Guide

    Azgirl71's Avatar
    Join Date
    Apr 2015
    Location
    Sierra Vista, Az
    Posts
    2,586

    Re: Acid dropped ph but not TA

    Quote Originally Posted by xray328 View Post
    Sorry I reversed those

    FC 9
    Ok. I was confused...lol
    Lisa
    Intex AG vinyl 15' x 48" 4,300 gallons due to skimmer install, Krystal Clear SF pump combo 2800 GPH, Krystal Clear SWG, Pool Blaster Max vacuum, Hayward thru the wall skimmer, TF 100 test kit with speed stir, K 1766 Taylor salt test, My SLAM Process

  7. Back To Top    #7
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Acid dropped ph but not TA

    You're well within the tolerances of the TA test. At most, you could have expected to see a drop of 20 TA.

    The big question is why are you worried about it? As the article is careful to explain
    You shouldn't lower TA just to reach a target number. Make sure you actually have one of the above issues before lowering your TA.
    The recommended 70-90+ goal is if you need to raise TA; you need a target. If you're above it, and you don't have some problem that requires immediate action, you just plug in your current TA as the target and move along.

    Micromanaging the chemistry seems too much like the pool store method to me, the continuous addition of expensive chemicals. You hit 7.8 pH, so something needed to be done, but I would have just targeted 7.2 or 7.3 and left it alone with out the need to aerate to get pH back up to the safe swimming zone.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  8. Back To Top    #8
    SCon36's Avatar
    Join Date
    Jul 2014
    Location
    Bedford, KY
    Posts
    118

    Re: Acid dropped ph but not TA

    I have had similar issues as you. Each time I added acid, the pH would go down but the TA would not or just barely. I found that my pH would go back up so I would add more. After several times, I am now seeing a drop in my TA. Keep at it. They can be rather stubborn at times.
    SCon36

    24,000 Gallon IG vinyl pool (16x36x8) with Hayward S200 sand filter and Hayward pump and heat pump. Built August 2011. I use a Taylor K-2005 test kit with a K-1515 add on.
    https://www.youtube.com/watch?v=bIgL...0MyAw&index=29

  9. Back To Top    #9

    Join Date
    Jul 2011
    Location
    Terre Haute indiana
    Posts
    60

    Re: Acid dropped ph but not TA

    my TA is running around 210-220 everything else is good so like Richard said I just let it be. Seems to do what it wants anyway
    19500 gal, IG, haywood s-200 sand filter & pump, 3/4 horse single speed motor, vinyl liner, tf 100 test kit, installed early 80's, Terre haute,In

  10. Back To Top    #10

    Re: Acid dropped ph but not TA

    Ok thanks guys. I'll bring it back up and try to worry less, enjoy more.
    24' AGP, 54" - 13,300 Gallons at 47".
    AquaRay Cleaner
    Hayward Swimpro Voyager Filter/2 Speed 2 HP Pump

  11. Back To Top    #11
    Divin Dave's Avatar
    Join Date
    Oct 2013
    Location
    Longview, Texas
    Posts
    4,926

    Re: Acid dropped ph but not TA

    thats a good idea. , the TA will eventually take care of itself.

    Quote Originally Posted by xray328 View Post
    Ok thanks guys. I'll bring it back up and try to worry less, enjoy more.
    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.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •