pH toooooo low!

Discussion in 'Reef Chemistry by Randy Holmes-Farley' started by d2mini, Feb 5, 2018.

  1. GoVols

    GoVols Cobb-Webb 1989 R2R Supporter Reef Squad Leader MTRCMember R2R Excellence Award Partner Member 2019 Partner Member 2018 Reef Tank 365 Build Thread Contributor Article Contributor

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    I'd run a cross check with a Salifert ph kit.
     

  2. Velcro

    Velcro Valuable Member

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    I
    It wasn't running, it couldn't.
     
  3. Brew12

    Brew12 Electrical Gru Staff Member Team R2R R2R Supporter R2R Excellence Award Partner Member 2019 Partner Member 2018 Reef Tank 365 Build Thread Contributor Article Contributor North Alabama Reef Club

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    The issue I have is that if this is "only" a calibration issue the tank would need to be running at 8.4-8.6pH normally. I'm not buying that. Not unless the Alk is in above 12dkh with lots of fresh air/algae.
     
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  4. d2mini

    d2mini Moderator Staff Member Team R2R R2R Supporter Photo of the Month Award R2R Excellence Award Build Thread Contributor Article Contributor

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    I just figured it was a stagnant water issue.
     
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  5. GoVols

    GoVols Cobb-Webb 1989 R2R Supporter Reef Squad Leader MTRCMember R2R Excellence Award Partner Member 2019 Partner Member 2018 Reef Tank 365 Build Thread Contributor Article Contributor

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    Just asking:
    Was your cal reactor on, during the six hour shut down?
     
  6. Potatohead

    Potatohead Well-Known Member

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    I am also beginning to suspect an equipment problem. Your pH goes to 7.57, exactly, each time? Odd.
     
  7. d2mini

    d2mini Moderator Staff Member Team R2R R2R Supporter Photo of the Month Award R2R Excellence Award Build Thread Contributor Article Contributor

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    No, just the internal circulation. Feed pump and c02 solenoid were unplugged.

    Yes, each morning it seems to bottom out at about that number. This week anyway.
    I'm not ruling it out, but I haven't seen signs over the long term that the probe is suddenly defective.
     
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  8. Potatohead

    Potatohead Well-Known Member

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    Do you run a probe in your reactor? Try swapping them.
     
  9. GoVols

    GoVols Cobb-Webb 1989 R2R Supporter Reef Squad Leader MTRCMember R2R Excellence Award Partner Member 2019 Partner Member 2018 Reef Tank 365 Build Thread Contributor Article Contributor

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    That's why I'd retest with a ph kit.

    @Velcro 's cup test is a good idea too.
     
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  10. d2mini

    d2mini Moderator Staff Member Team R2R R2R Supporter Photo of the Month Award R2R Excellence Award Build Thread Contributor Article Contributor

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    ya, i can do that but would probably have to recalibrate since its calibrated with the lower calibration fluids.

    Yup, i don't have a reef ph kit but I have a saltwater pool test kit that should work, no?
     
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  11. GoVols

    GoVols Cobb-Webb 1989 R2R Supporter Reef Squad Leader MTRCMember R2R Excellence Award Partner Member 2019 Partner Member 2018 Reef Tank 365 Build Thread Contributor Article Contributor

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    Lol!!!
    I'm clueless :confused: on a pool kit.

    At least it's for a saltwater pool :D

    Tagging :)
     
  12. d2mini

    d2mini Moderator Staff Member Team R2R R2R Supporter Photo of the Month Award R2R Excellence Award Build Thread Contributor Article Contributor

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    Well i figure ph is ph so that's what I'm going to use. :D
     
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  13. Velcro

    Velcro Valuable Member

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    Saltwater pool test kit? I knew you were fancy but dang.
     
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  14. d2mini

    d2mini Moderator Staff Member Team R2R R2R Supporter Photo of the Month Award R2R Excellence Award Build Thread Contributor Article Contributor

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    LOL! Dude, it's a ghetto above ground pool from Academy Sports. :D
    Comes with chinese sand filter but I added the same cheap brand saltwater filter to it. lol
    https://www.amazon.com/Intex-Rectangular-Filter-Ladder-Ground/dp/B073FMDBLJ/

    But the family has a blast. Even my wife and I since it has 4' of water in it. :)
    Sooooo worth it, even if I only get a couple seasons out of it. No way i'm spending 50+k on an in-ground pool.
    And the filters have worked great. The water is always so clear I hardly ever test it.
    Only pain in the butt is removing all the leaves every week. Putting the cover on is even more hassle so I don't bother.

    Since this thread is on hold until I get home later, here's a little show and tell. haha

    [​IMG]

    [​IMG]

    [​IMG]

    Even installed new circuits for the pumps.
    Trenching through/under tree roots in the 100+ degree heat was not fun!!!

    [​IMG]
     
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  15. bubbaque

    bubbaque Never enough SPS R2R Supporter Reef Tank 365 Build Thread Contributor

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    Hey, I have that same pool, lol! I don't have that fancy pole for the outlets though.
     
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  16. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

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    It may be OK, but isn't guaranteed to be so. The pKa of ions in seawater generally shifts from freshwater (because it is easier to make ions in seawater than fresh due to all the other ions around it, stabilizing it), so the color change (which is a change of ionic state of the dyes as the pH changes) can take place at a slightly different pH.

    For example, the pKa (the half point of this acid base reaction) of this transition for phospathe changes a lot:

    H2PO4- <----> H+ + HPO4--

    pKa pure water: 7.20
    pKa seawater; 5.86

    So if one of these forms was a different color than the other and you used it as a pH indicator (color change would be near the pKa), it might be off by more than a full pH unit in seawater compared to pure fresh water.
     
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  17. Potatohead

    Potatohead Well-Known Member

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    Weak


    The pool is saltwater
     
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  18. d2mini

    d2mini Moderator Staff Member Team R2R R2R Supporter Photo of the Month Award R2R Excellence Award Build Thread Contributor Article Contributor

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    ROFL!!!!! :D



    True, but saltwater pools have a much lower concentration of salt. It's equivalent to human tears.
    Throw some tankwater in your eyes and tell me how that feels. :D
     
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  19. Scorpius

    Scorpius Valuable Member

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  20. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

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    Sorry, i thought we were talking about using a pool pH kit (or even a hobby freshwater pH kit) for pH in seawater. That's my concern. :)
     
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