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

Thread: Ph for SWG's question

  1. Back To Top    #1

    Ph for SWG's question

    I've always run my ph around 7.2 with no problems. Now that I have a SWG and have read the Pool School section on SWG water balance I see the ph reccomendation there is 7.5-7.6. I'm confused: I thought SWG's cause ph to drift up, so wouldn't one want to start in the lower acceptable range so that when the ph went up you wouldn't find yourself having to bring it down so much? Thanks for the help, I always learn so much on TFP!
    My Pool:
    18 x 33 Johnny Weissmuller
    Hayward EC 50
    Hayward 1.5 2 speed pump

  2. Back To Top    #2

    In the Industry

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

    Re: Ph for SWG's question

    Sometimes, we tend to be overly specific. Generally, any pool pH in the 7's is fine so it is easy to say 7.5 as being perfect.

    In other words, your pH of 7.2 is fine and that's probably where I'd target the lower end of my pH if I had an SWG. I would then let it drift to around 7.8 before bringing it back down to the 7.2 lower end.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3

    Re: Ph for SWG's question

    Thanks so much Dave
    My Pool:
    18 x 33 Johnny Weissmuller
    Hayward EC 50
    Hayward 1.5 2 speed pump

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Ph for SWG's question

    With a SWG, your PH will tend to drift up much more than it did when you didn't have a SWG. Maintaining a higher PH helps stop the PH from drifting. The rate of PH drift increases when PH is lower and when TA is higher. That is why we recommend a lower TA and higher PH when you have a SWG. If you try to keep the PH at 7.2 you will probably need to use a lot of acid, which is annoying and can cause other problems.

    If your PH remains stable around 7.2, then just ignore everything I said.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

Posting Permissions

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