Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 3 of 3

Thread: 50% diluted sample, can I work out the true pH?

  1. Back To Top    #1

    Join Date
    Jul 2010
    Location
    England, UK
    Posts
    156

    50% diluted sample, can I work out the true pH?

    I just got back from putting the pool to bed and realised that I did both my tests on a 50% dilution sample. I know you can multiple FC by two, but that's not true for pH. Is there a way to work out the true pH from the pH on a 50% dilution sample? I think I read it on here once, but now I can't find it again.

    The pH at 50% dilution was 7.65.

    Thank you.
    90k litres, outdoor in ground pool, concrete, painted (I hate paint)
    Sta-Rite 5P2R 1.5 Hp pump, undersized sand filter (needs upgrading).

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

    Re: 50% diluted sample, can I work out the true pH?

    No.

    Well, theoretically it's possible, but you'd need to know the pH of the dilution water. And if you're going to test pH on something anyway, might as well just do the pool water itself and save yourself the math.
    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

    Join Date
    Jul 2010
    Location
    England, UK
    Posts
    156

    Re: 50% diluted sample, can I work out the true pH?

    Ah well, never mind. I'm not trekking out to the pool again today. It can wait until morning.

    I'm testing every 2 hours (UK guidelines for a manually dosed pool) and I've had enough for one day.
    90k litres, outdoor in ground pool, concrete, painted (I hate paint)
    Sta-Rite 5P2R 1.5 Hp pump, undersized sand filter (needs upgrading).

Posting Permissions

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