Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 4 of 4

Thread: TA effect on pH -- can LOW TA cause pH rise?

  1. Back To Top    #1

    TA effect on pH -- can LOW TA cause pH rise?

    I read that if the TA is too high it can lead to the pH creeping up, but I'm curious if pH rise can also be caused by having the TA to low. My pH is constantly going up -- I have to add a does of acid (i.e. to drop pH 1 ppm) at least twice a week if not more to keep it at 7.4. My plaster is probably between 2 and 3 years old now, and I'm told that this is long enough to no longer have an effect on pH. My TA hovers around 60 or a bit higher, which I read was okay, but I'm wondering if this could helping the pH constantly rise, and if it's worth trying to raise the TA a bit.

    I use a combination of pucks and liquid chlorine in a non-SWG pool.

    I've noticed the same effect for the entire year that I've been here -- i.e. regardless of my specific chemical balance I see the same pH rise -- but my current test results are:

    FC - 6
    CC - 0
    pH - 7.4
    TA - a bit above 60
    CYA - around 65
    CH - 400 ish

    Thanks,

    Larry
    Los Angeles, CA -- 22K gallon in-ground plaster pool with spa, built around 1980, replastered around 2009-2010.
    Pentair Intelliflo VS (variable speed) pump and Quad 100 DE filter. Older "MiniMax" gas heater. Pentair Rebel cleaner.
    NO SWG - Liquid Cl only. Taylor K-2006 test kit.

  2. Back To Top    #2
    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    Location
    SW Indiana
    Posts
    9,089

    Re: TA effect on pH -- can LOW TA cause pH rise?

    Low TA can cause the pH to be unstable when trying to adjust, but won't cause a steady rise. How do you chlorinate?
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  3. Back To Top    #3
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: TA effect on pH -- can LOW TA cause pH rise?

    Do you have a waterfall / deck jets / etc? Aeration can cause the pH to go up.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  4. Back To Top    #4

    Re: TA effect on pH -- can LOW TA cause pH rise?

    Chlorination is a combination of pucks and liquid. I try to use enough pucks so that I don't need to add chlorine more than twice a week, and they keep the FC level from dropping too fast.

    I don't have any waterfalls or deck jets. I do have a spa with an air intake for some bubbles, but there is no blower on it. Also, we don't use the spa every day, and when we do use it, it's typically only for an hour or so on average. My Kreepy Krauly does pull in a bit of air -- I can see some fine bubbles at some of the returns. Could this be enough to cause such a constant, steady pH rise? I see some people saying that they only add acid a few times a season, which is a vast difference when compared to the two to three times a week that I need to add it.

    Larry
    Los Angeles, CA -- 22K gallon in-ground plaster pool with spa, built around 1980, replastered around 2009-2010.
    Pentair Intelliflo VS (variable speed) pump and Quad 100 DE filter. Older "MiniMax" gas heater. Pentair Rebel cleaner.
    NO SWG - Liquid Cl only. Taylor K-2006 test kit.

Posting Permissions

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