Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 8 of 8

Thread: PH Issues

  1. Back To Top    #1

    Join Date
    May 2015
    Location
    Chandler
    Posts
    105

    PH Issues

    Hi,
    I've been doing the TFP method for about a month or so. Not having problems with FC, but PH keeps going up. I just had to add 90oz after 5 days and had been adding about 40 oz every 2-3 days before that. Trying to keep PH at 7.5 or so and it keeps going to 8.2. I live in Chandler, AZ which has averaged 105-110 degrees over the last couple weeks. I also just resurfaced the pool in October. Here are my numbers, I just took. And yes, I know I need to raise my FC to be 8. Adding today. Is it high temps? New surface? Liquid chlorine (I read somewhere liquid raises PH)?

    FC - 3
    CC - 0
    CYA - 70
    PH - 8.2
    TA - 100
    CH - 500
    Borates - 40
    14,000 gallon pool, plaster, Pentair FNS 60 DE, Variable speed pump, Chandler, AZ (Phoenix area)

  2. Back To Top    #2
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: PH Issues

    If you've got new plaster, you'll be feeding the pool a lot of acid for a few months.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  3. Back To Top    #3
    Mod Squad kimkats's Avatar
    Join Date
    Jul 2012
    Location
    Tallahassee, FL
    Posts
    26,694

    Re: PH Issues

    Do you have a fountain or waterfall? Are your returns turned up so that they break the water and roll the water? All of these can cause PH to go up.

    Pool School - Recommended Levels

    Look at the levels in the link. Look at the CH for a plaster pool. Your CH is high.

    I wonder if the high PH and CH are from the new plaster?

    Liquid chlorine does not make my PH go up.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

  4. Back To Top    #4

    Join Date
    May 2015
    Location
    Chandler
    Posts
    105

    Re: PH Issues

    No my fountains are not turned on I do have them but they were not turn on all week. The pressure does make the water move but I would not describe it is rolling. And yes I know my calcium is high, I'm planning to drain in the fall when it's not so hot. With the high calcium affect the pH? One of my questions was whether or not the new plaster is messing with the pH.


    14,000 gallon pool, plaster, Pentair FNS 60 DE, Variable speed pump, Chandler, AZ (Phoenix area)

  5. Back To Top    #5

    Join Date
    May 2015
    Location
    Chandler
    Posts
    105

    Re: PH Issues

    Thanks Kim and Richard. Richard that makes sense, since the new plaster was put in in October would I still be adding the acid through August?


    14,000 gallon pool, plaster, Pentair FNS 60 DE, Variable speed pump, Chandler, AZ (Phoenix area)

  6. Back To Top    #6

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,082

    Re: PH Issues

    since the new plaster was put in in October would I still be adding the acid through August?
    Some but not as much as you indicate.

    First of all, rising pH is a natural occurrence in a pool and you can manage it perhaps a little better but you can hardly ever stop it.

    I would suggest you lower your TA down to around 60 ppm. Many folks (but not all) report noticeable success with controlling the RATE of the rise if the TA is held down low

    You will need muriatic acid and you will need to follow the article in Pool School on lowering TA.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  7. Back To Top    #7

    Join Date
    May 2015
    Location
    Chandler
    Posts
    105

    Re: PH Issues

    Thx duraleigh. Will try that.


    14,000 gallon pool, plaster, Pentair FNS 60 DE, Variable speed pump, Chandler, AZ (Phoenix area)

  8. Back To Top    #8

    Join Date
    May 2015
    Location
    Chandler
    Posts
    105

    Re: PH Issues

    I figured out on the calculator that to lower ph from 8.2 down to 7.2 it is 46 oz of acid (28%). If I have 40 borates then it is 113 oz. That's why I'm having to add so much acid. 40 oz a week is pretty normal during 110 degree days.


    14,000 gallon pool, plaster, Pentair FNS 60 DE, Variable speed pump, Chandler, AZ (Phoenix area)

Posting Permissions

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