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

Thread: What causes TA to creep up?

  1. Back To Top    #1

    Join Date
    Apr 2010
    Location
    Sunny Phoenix AZ
    Posts
    74

    What causes TA to creep up?

    Hey guys,
    So about 2 weeks ago I set out to lower my TA to keep ph from rising too quickly.
    I was successful in getting the TA down from something like 120 to 65-70ish using a couple cases of MA.
    The bright side is that with lower TA it takes less acid to keep the ph down. However, it still takes significant amounts of acid to keep it down every week (1 gal twice a week of 14.5% seems to be the going rate).

    Anyways I tested my TA yesterday and was surprised to see it had risen to 85-90ish. Our source water has TA of about 120, so it would have taken a tremendous amount of refilling to make this happen in such a short period of time. What causes your TA to rise quickly?

    We have an old plaster pool so it isn't any odd effects from getting a new pool.
    I haven't added anything but liquid chlorine and acid (and 50ppm CYA after draining the pool a month or so ago)...

    I suppose it could be sampling or testing error - I'll test it again tonite before I add my chlorine...I always sample after the pump has been running at least an hour and I take the sample elbow deep on the deep end in front of a return, for consistency...
    28,000 gallons / Plaster / Hayward 30" Sand Filter / PoolCleaner 4x / PoolSkim / Hayward RS1500 / CircuPool RJ60

  2. Back To Top    #2

    Join Date
    Mar 2010
    Location
    Spring, TX
    Posts
    1,082

    Re: What causes TA to creep up?

    When you do the TA test, make sure to wipe the dropper after every 4-5 drops from what I have read. Sometimes it can built up static and throw your test off. I always have a cloth and just wipe mine off after each drop. You want to try and get the drops the same size if possible each time.
    13,000 Plaster IG Pool approx
    Hayward C5030 Cart Filter
    Emerson 1081 EB653 1.0 HP 1.40 S.F. 3450 RPM
    Pool Calculator, Pool School, TF Test Kits

  3. Back To Top    #3
    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    Location
    SW Indiana
    Posts
    9,089

    Re: What causes TA to creep up?

    Comparing TA readings can only be done if the pH is the same for both TA readings.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  4. Back To Top    #4

    Join Date
    Apr 2010
    Location
    Sunny Phoenix AZ
    Posts
    74

    Re: What causes TA to creep up?

    ahhh, excellent answers, both of you.
    I'll start wiping the bottle and I'll test the TA after I adjust the ph.

    Thanks guys.
    28,000 gallons / Plaster / Hayward 30" Sand Filter / PoolCleaner 4x / PoolSkim / Hayward RS1500 / CircuPool RJ60

Posting Permissions

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