Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 7 of 7

Thread: pH Test Question

  1. Back To Top    #1

    Join Date
    Oct 2011
    Location
    Orlando, FL
    Posts
    63

    pH Test Question

    Hi there, I don't know if I have a ghost in my water or what, but after more than a year of easy-peasy testing, I'm having trouble this year with the basic tests.

    I discovered that I am unable to do a proper CL test anymore. See here if you care chlorine-consumption-shocking-testing-maybe-not-insects-t63318-20.html This problem is still there - no two test are ever the same...

    Now, the pH test is acting weird. I'm not talking about that it's hard to read the color - I've figured that out by now. What happens is this. If I shake the bottle a few times, I read a certain pH, around 8 in this case. Shaking vigorously a few more times, it drops to a lower number, around 7.5. And I know you won't believe me, but shaking it vigorously a few more times, it drops even more, in this case to 7.2!!! No further shaking would change it any further.

    I mean, how many shakes is the right amount? I've always just shook it maybe 5-10 times and used that result. And it turns out another 5-10 it changes???

    Or what is your experience with haunted water?
    screened-in 10,500 gal IG gunite pool, DiamondBrite, 1.5 HP Hayward Super II Pump, Hayward Star-Clear Plus C1200 Cartridge Filter, Hayward Pool Vac Ultra, 6 solar panel heater.

  2. Back To Top    #2
    harleysilo's Avatar
    Join Date
    Mar 2012
    Location
    North Georgia
    Posts
    1,924

    Re: pH Test Question

    You vigorously shake the PH test?

    I just turn it upside down and right side up a few times......
    18'x43' Sport Pool
    19,000 Gallons Vinyl Liner 3'-3.5'-4'
    SWCG and D.E. Filter
    Test Kits - Pool Calculator - Chlorine/CYA Chart - Pool School

    Secret Weapon for Pool Chemistry Testing

  3. Back To Top    #3

    Join Date
    Jul 2011
    Location
    St. Paul, MN
    Posts
    244

    Re: pH Test Question

    Very strange.

    It shouldn't matter how much you shake it.

    I would try giving the test vial a good cleaning.
    20'x40' Oval 27,000 gallon Vinyl IG, Coverstar Auto Cover
    Hayward MaxFlo SP2303VSP, Sta-Rite PLD50 30 sq. ft. DE filter
    Rheem 266,000 btu natural gas heater
    Dolphin Nautilus Plus with Clever Clean
    TF-100 testkit w/ Speed Stir

  4. Back To Top    #4

    Join Date
    Oct 2011
    Location
    Orlando, FL
    Posts
    63

    Re: pH Test Question

    Quote Originally Posted by harleysilo
    You vigorously shake the PH test?

    I just turn it upside down and right side up a few times......
    Right, that was my normal operating mode, as well. But then I'm noticing that shaking it up changes it, so naturally now I wonder: When is the 'right' amount of shaking to read the test!
    screened-in 10,500 gal IG gunite pool, DiamondBrite, 1.5 HP Hayward Super II Pump, Hayward Star-Clear Plus C1200 Cartridge Filter, Hayward Pool Vac Ultra, 6 solar panel heater.

  5. Back To Top    #5
    harleysilo's Avatar
    Join Date
    Mar 2012
    Location
    North Georgia
    Posts
    1,924

    Re: pH Test Question

    Well I've never shaken it, since the instructions say Invert. However now i'm going to and see what happens, i should try the speedstir too!
    18'x43' Sport Pool
    19,000 Gallons Vinyl Liner 3'-3.5'-4'
    SWCG and D.E. Filter
    Test Kits - Pool Calculator - Chlorine/CYA Chart - Pool School

    Secret Weapon for Pool Chemistry Testing

  6. Back To Top    #6

    In the Industry

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

    Re: pH Test Question

    My impression is you are trying too hard to "fool" this test. After you add the five drops, you shake it well enough for the color to be uniform throughout the column and that's the end of the test.

    There is no point shaking it further so I have no idea if that will affect the test result or not. I usually get the column mixed well in about 1 second.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  7. Back To Top    #7

    Join Date
    Oct 2011
    Location
    Orlando, FL
    Posts
    63

    Re: pH Test Question

    Thanks. I wasn't trying to fool it on purpose, but just noticed that just a few extra shakes change the color significantly. It just doesn't seem that this would be normal ...
    screened-in 10,500 gal IG gunite pool, DiamondBrite, 1.5 HP Hayward Super II Pump, Hayward Star-Clear Plus C1200 Cartridge Filter, Hayward Pool Vac Ultra, 6 solar panel heater.

Posting Permissions

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