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

Thread: High PH and Low TA

  1. Back To Top    #1

    Join Date
    Jul 2008
    Location
    Indianapolis, Indiana
    Posts
    7

    High PH and Low TA

    I have been having some slight issues with the PH. I started with the BBB method this year and I use the Taylor test kit. Here is where I'm at from last night.

    PH 7.8
    FC 4.0
    CC 0.0
    TA 80
    CH 210
    CYA 40

    The PH seems to keep rising slowly (not bouncing) so when I add Muriatic acid the PH drops and the TA drops. Lately the PH seem to rise over a week from 7.4 to 7.8. I thought it was the rain we had in June (over 9") but its been dry in July and still doing it. We are not using the pool a lot and the kids are older so they tend to just float to tan instead of splashing around. There is a 1/2 tube with water flowing into the pool over the edge of the pool from my small solar heater I built from irigation tubing, but not much splashing.

    What can I do to get the PH lower but the TA to stay at 80 or raise it towards 100.
    18' AG Vinyl Pool (7,500 gal)
    1.5 HP Hayward pump and sand filter 150#
    Using the BBB Method
    Taylor K-2006 test kit

  2. Back To Top    #2
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,331

    Re: High PH and Low TA

    Honestly why do you want the TA at 80 or 100 if your pH keeps rising. Let it go to 70 or so and see what happens to the pH. It might settle down and not rise at all and if it does it'll probably be a lot slower.

    If you're convinced on raising it you can overshoot the pH lowering a tiny bit then use use Baking soda to ring the TA back up afterwards.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  3. Back To Top    #3

    Join Date
    Feb 2009
    Location
    NW Chicago Suburb, IL
    Posts
    75

    Re: High PH and Low TA

    Does your ph continue to rise above 7.8 if you do nothing?

    The reason I ask is this. Last year and at the beginning of this year I was always trying to keep my ph around 7.5 or so. It would go up to 7.7-7.8 and I would hit it with acid to bring it down. Constantly repeating the process.

    So I decided to not adjust the ph and see if it would continue to rise. It went to 7.8 and has been there for weeks now. No adjusting by me. Even with tons of swimming and the slide being on. I guess my pool just wants to be at 7.8. I'm fine with it as I no longer have to add acid.

    Might be worth just seeing if it will stop at 7.8 for your pool.
    15,000 Gallon IG 15x30 fiberglass
    CoverStar auto safety cover
    SWG Aqua PL-PLUS
    Cartridge Filter
    240,000 LXI Heater

  4. Back To Top    #4

    Join Date
    Jul 2008
    Location
    Indianapolis, Indiana
    Posts
    7

    Re: High PH and Low TA

    It has been at 7.8 for the past two days. I'll let it go for a while longer to see if it continues upward. The reason I was concerned about the TA was it started at 100 and has dropped to 80 when I tried to get the PH to stay at 7.4 I was concerned that it would continue to drop below 80. The suggested TA for my pool is 80-100 I thought. I'll wait and see what happens over the week and post the results.
    18' AG Vinyl Pool (7,500 gal)
    1.5 HP Hayward pump and sand filter 150#
    Using the BBB Method
    Taylor K-2006 test kit

  5. Back To Top    #5
    benavidescj's Avatar
    Join Date
    Apr 2010
    Location
    Fleming Island, FL
    Posts
    431

    Re: High PH and Low TA

    TA recommendation of 80-100 is just that, a recommendation. If you water chemistry is happier at slightly lower values then so be it. Mine sits a 70 and does not move too much. My pH rises constantly (mostly because I have a SWG and my plaster is still curing).
    Carlos
    Pool: 28,000 gallons IG; IC 40 SWG; Pentair 120 gpm cartridge filter; Marble finish; Pentair Wisperflow 1.5 hp; Polaris 360
    Spa: 350 gallon; Bromine
    How to shock your pool

  6. Back To Top    #6

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,077

    Re: High PH and Low TA

    fjdavid,

    All good advice above. If you decide to raise your TA and keep your pH almost constant, use baking soda per the pool calculator.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  7. Back To Top    #7

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: High PH and Low TA

    You can let the TA get quite a bit lower than 80 ppm without a problem, though 50 ppm would probably be a lower limit just to have some pH buffering in the water. Since your pool is vinyl, you won't need to raise the CH to compensate to keep the saturation index near zero as you would need to do with a plaster pool. This chart shows how much over-carbonation is in your pool and you can see that as the pH gets higher or the TA gets lower things are far less out-of-balance.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  8. Back To Top    #8

    Join Date
    Jul 2008
    Location
    Indianapolis, Indiana
    Posts
    7

    Re: High PH and Low TA

    I've been watching the PH for the past two weeks and if I do nothing it went up to 8.0 so I added acid to bring it back down to 7.2 and let the PH rise on its own. That was on the 20th. last night the PH was back up to 7.8 so it takes about 10 days to go from 7.2 to 7.8. At first I thought it was from all of the rain in June but July has been very dry in central Indiana. I guess its nothing to worry about but I don't understand what is making it continue rise so much. There's not a lot of splashing going on since the kids are older and not using the pool much lately. Anyway thanks for the info. I'll just keep an eye on it.
    18' AG Vinyl Pool (7,500 gal)
    1.5 HP Hayward pump and sand filter 150#
    Using the BBB Method
    Taylor K-2006 test kit

  9. Back To Top    #9

    Join Date
    Jul 2014
    Location
    Westport, CT
    Posts
    64

    Re: High PH and Low TA

    Hi all. I have similar high PH and low TA issues upon just opening the pool for the season.
    My results are a bit wacky and as follows:

    PH 8.2+ (9 per pool store, rich magenta color beyond scale of my Taylor test)
    TC 0 (although I just added 5 gallons of 12.5% bleach to bring to shock level)
    TA 60 (70 per pool store)
    CH 175 (140 per pool store)
    CYA 25

    I'm not certain which to do first as I have no idea what my real PH is. The pool store suggests bringing my alkalinity up first, and then add acid, and finally calcium hardness.
    I will use baking soda, muriatic acid, and BJs ice melt (99% calcium chloride) instead of the pool store products.

    Any thoughts?
    48,000 IG Gunite - Pool built 1999
    Hayward DE-6000 Filter w/ C-1100-SEP Separation Tank
    Hayward Super Pump 2.0-HP : SP1615Z1MEG
    Hayward H-Series heater
    TF-100 Test Kit

  10. Back To Top    #10
    epro05's Avatar
    Join Date
    Jun 2014
    Location
    Keller, Texas
    Posts
    270

    Re: High PH and Low TA

    I am happy at a TA of 60 and a pH of 7.8. With my other values, CSI is close to 0.0, which also makes my happy. My pH rises more slowly now than when my TA was 80. If my pH rises to 8.0 I only add a few oz of MA to bring it back to 7.8. That seems to be my pools "happy point".
    27,500 gallon in ground gunite/plaster (1995). Attached Spa with fountain, spillway, and 2 lion heads streaming into the pool. Hayward pump and AO Smith UST1152 1.5 hp motor (single speed). Hayward 60 sq ft DE Filter (Model DE-6000). Kreepy Krauly cleaner.

  11. Back To Top    #11
    poolnoob.ca's Avatar
    Join Date
    May 2014
    Location
    Georgetown, ON, Canada
    Posts
    277

    Re: High PH and Low TA

    I just realized this thread is from 5 years ago. Should start a new thread, newhomeowner. Best wishes
    32,000L Fibreglass Leisure Pools IG 12.5'x23'x5' Pump: AstralPools BX1 1.0HP
    Filter: AstralPools ZX-310 SWCG: AstralPools VX7T
    Heater: Hayward H250FDN Test Kit: TF-100

Posting Permissions

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