Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 7 of 7

Thread: Lowering TA Testing and Aeration questions

  1. Back To Top    #1
    Johnmarkpainter's Avatar
    Join Date
    Apr 2016
    Location
    Hendersonville, TN
    Posts
    47

    Lowering TA Testing and Aeration questions

    So...with the TF-100 test kit, often there is a drop that causes it to be pink for a second and then clear.
    The next drop might just be a little pink. One more drop and you have a good obvious color change.
    Do you take the reading as the last drop or somewhere in between?

    Question 2: My TA was 120 and PH was 7.8
    I added MA and got the PH down to 7.2 and the TA down to 80-90 (depending upon the answer to question 1).

    I set my return jets to agitate the water.
    How drastic of a PH change am I likely to see?
    As in....tomorrow, it wouldn't be very high if I let the agitation continue all night will it?

    I am guessing I will be doing another (smaller) round of MA to get down in the 70-80 range.
    I did get a solid reduction of 30ppm retesting about an hour after adding the MA.

    And if it matters...I plan to add Borates soon. Just waiting on the test to come in.
    28,000 Gallon, IG, Vinyl, SWG, Sand Filter
    Goldline Aqua Rite SWG
    Hayward Pro Series Sand Filter
    Flotec Pump
    Hayward Turbulent Flo Chamber

  2. Back To Top    #2
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,947

    Re: Lowering TA Testing and Aeration questions

    The rule of thumb for color change is basically to keep adding drops until there is no change. When the last drop changes nothing, discard that last drop from the count. How long will raising pH take? It depends on the amount of aeration provided and what is being used. Some might go from 7.2 to 7.5 in a matter of a couple hours. Others might take overnight, etc. All in all, it sounds like you are doing everything quite well.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  3. Back To Top    #3
    Mod Squad Jimrahbe's Avatar
    Join Date
    Jul 2014
    Location
    Bedford, TX
    Posts
    5,311

    Re: Lowering TA Testing and Aeration questions

    What works best for me is to drop the pH with acid to 7.0 and then immediately aerate. The key is to check the pH again in three or four hours, then add acid again to bring it back to 7.0.. and keep repeating until you get the TA down to a little less than you want. Then quit adding acid and aerate until the pH comes back up to 7.5 or so. I do this routine on three pools in the DFW area. They all have SWGs, but no constant water features. I do not use Borates and my pH will stay between 7.5 and 7.8 for several months in a row before I have to do the process again. The process takes me less the two days most of the time. When I tried to do this with longer periods between acid additions, it seemed to take several days to a week.

    Jim R.

    I use this to aerate..

    Aerator.jpg
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Calder Spa.

  4. Back To Top    #4
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,947

    Re: Lowering TA Testing and Aeration questions

    Ha. I have the same water device. Cheap, easy, effective, and usually fun for the kids.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  5. Back To Top    #5
    Helen203's Avatar
    Join Date
    Jul 2015
    Location
    Annapolis, MD
    Posts
    813

    Re: Lowering TA Testing and Aeration questions

    Nice, my current goal is to bring my TA down from 100. I'm going to try Jim's advise to test and adjust pH every few hours. Hopefully I can bring it down to 60 or 70.

    ETA: Its working!! Every 2 hours I retest pH and TA, then add another quarter gallon of muriatic acid. TA has dropped from 100 to 80. Pool Math says I'll need about a gallon of MA before all is said and done.
    My Pool Build (2015): inground 12K gals gunite/plaster pool, SWG, 2-speed pump, cartridge filter, gas heater, and polaris cleaner (Jandy). TF-100 Test Kit w/ Speed Stir

  6. Back To Top    #6
    Johnmarkpainter's Avatar
    Join Date
    Apr 2016
    Location
    Hendersonville, TN
    Posts
    47

    Re: Lowering TA Testing and Aeration questions

    SO I went ahead and added more MA last night to get the PH down to 7.0
    My TA is now down to 80 and the PH is back up to 7.2
    Will keep on aerating today and do another round to get the TA down to 70 tonight
    28,000 Gallon, IG, Vinyl, SWG, Sand Filter
    Goldline Aqua Rite SWG
    Hayward Pro Series Sand Filter
    Flotec Pump
    Hayward Turbulent Flo Chamber

  7. Back To Top    #7
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,947

    Re: Lowering TA Testing and Aeration questions

    You got it! That's the TA drill.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

Posting Permissions

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