Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 6 of 6

Thread: Constantly rising PH

  1. Back To Top    #1

    Join Date
    May 2016
    Location
    New orleans, Louisiana
    Posts
    10

    Constantly rising PH

    I know this has been discussed before, but just wanted to see if anyone had ideas, as I think I've tried most strategies suggested.

    I have an approx 9 month old gunite pool with diamond-brite plaster. There is a flush spa with a continuous spillway (there's really no splash or I think aeration from it, it just runs over the edge and down about 1" to the pool depending on the pool level - sort of a slick look). I run in pool mode all the time (meaning all pool and two spa returns are on but only pool drain is on, to keep spillway moving constantly), about 14 hours a day. The returns are not turned up, and we don't use the spa that often. There is a vacuum that runs every other day, but I don't think it's contributing to aeration. Pool gets a lot of sun.

    My PH is constantly rising to 8.0. I have tried low TA (~70) and high TA (~125) and it doesn't seem to matter, although of course the TA gradually drops as I lower the PH over and over. I use a taylor reagent test kit. My Calcium is about 375. At PH of 8.0, I am over the saturation index safe point most of the year here (with water temps over 70 almost all the time and even 90s in summer).

    Any suggestions to get off the acid train? I am adding every 2-3 days, using dry acid. When I have adjusted TA, I did it with baking soda.

    Many thanks in advance

  2. Back To Top    #2
    PoolingAround's Avatar
    Join Date
    May 2016
    Location
    Katy, Texas
    Posts
    214

    Re: Constantly rising PH

    Any source of aeration is going to cause higher PH. My spillway drops about a foot (which I run all day) and I'm constantly battling high PH. I too have only had the pool 9 months so part of this due to new plaster. I'm hoping after a year it stabilizes.
    18k gallon, 20x32, salt IC20, gunite with quartz finish, raised spa with overflow, flagstone coping, moss rock waterfall, Pentair Intelliflo variable speed pump, Pentair Racer, Pentair pool pump, cartridge filter, heater, etc., acid dispenser.
    TF-100 kit for sparkling clean water.

  3. Back To Top    #3
    Mod Squad YippeeSkippy's Avatar
    Join Date
    Jan 2012
    Location
    'burbs of Augusta, Georgia
    Posts
    8,577

    Re: Constantly rising PH

    Also, even though your pool is 9 months old and should be stabilizing over time, its still a new pool. New pools with plaster do this for a while.

    Keep dosing it with the MA, and using PoolMath to monitor the CSI. Try turning that small spillover valve off and see if that changes things.

    Yippee
    Maddie :) 12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
    Skippy's Pool Cooler --> Skippy's New Fountain Our Build --> Our Pool Solved Our Sloping Yard

  4. Back To Top    #4

    Join Date
    May 2016
    Location
    New orleans, Louisiana
    Posts
    10

    Re: Constantly rising PH

    Quote Originally Posted by YippeeSkippy View Post
    Also, even though your pool is 9 months old and should be stabilizing over time, its still a new pool. New pools with plaster do this for a while.

    Keep dosing it with the MA, and using PoolMath to monitor the CSI. Try turning that small spillover valve off and see if that changes things.

    Yippee
    Thanks

    Unfortunately I don't think I can turn off the spillover because that's the only way the spa circulates. I don't think I could consistently balance the drain and returns between the pool and spa as separate systems.

  5. Back To Top    #5

    Join Date
    Mar 2017
    Location
    Naples/FL
    Posts
    73

    Re: Constantly rising PH

    I've got a new pool and have nearly the same chemistry now as you except I've added Boric Acid to 50 ppm. It slowed the Ph rise. I'm now dropping TA from 80 to 60 to measure that effect.

    My situation: New Pool Alkalinity and PH.
    17,250 gallon plaster pool & spa, IC40 SWCG, Cartridge Filter, CYA 70-80, Boric 50 ppm, Temp~84F, Naples, FL.

  6. Back To Top    #6

    Join Date
    Jun 2015
    Location
    Mandeville, LA
    Posts
    109

    Re: Constantly rising PH

    My pool is just now a year old. It ate a LOT of acid last season. I found that getting my TA to 60 kept my acid additions to about once every 3 days. For the first 4 months or so I was having to add daily. Things held pretty steady over the cold winter months and water. We shall see how it does year two. So far it seems to have slowed way down but we are not using the pool yet and water and air temps are just about 80.

    If you have constant spillover and a SWG you are going to use acid. No way around it. I think getting your TA down to 50-60 will help.
    Completed April 2016: 22x36 3.5-5.5-4 Inground, 17,500 gallons, Aquapure SWG, Jandy 2hp Variable Speed, Jandy 460 Cartridge Filter, Polaris 280, Aqualink PDA4, Jandy Nichless LED lights, Diamondbrite color Steel Blue, Noche Travertine Coping & Deck

Posting Permissions

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