Potassium test kit numbers

Discussion in 'Reef Chemistry by Randy Holmes-Farley' started by spspirate, Mar 18, 2017.

  1. spspirate

    spspirate Tidepool Explorer Staff Member Team R2R R2R Supporter R2R Excellence Award Partner Member

    Joined:
    Dec 25, 2009
    Messages:
    9,306
    Likes Received:
    1,760
    Location:
    Richmond, Va
    Hey guys. I'm looking for a potassium test kit that will measure much higher than 470ppm. I have the salifert and that's where it tops out at. Which one reads well beyond that? Thanks :) just playing around with my potassium levels to see if there's any deeper/richer pigment change with a few of my corals.
     
    Last edited: Mar 20, 2017
    Tags:
  2. spspirate

    spspirate Tidepool Explorer Staff Member Team R2R R2R Supporter R2R Excellence Award Partner Member

    Joined:
    Dec 25, 2009
    Messages:
    9,306
    Likes Received:
    1,760
    Location:
    Richmond, Va
    Bump
     
  3. TUSI

    TUSI Well-Known Member R2R Supporter Reef Spotlight Award Photo of the Month Award Reef Squad

    Joined:
    Oct 6, 2013
    Messages:
    1,923
    Likes Received:
    1,760
    Location:
    GARDEN CITY NY
    tought salifert reads higher but anyway higher will kill everything
     
  4. spspirate

    spspirate Tidepool Explorer Staff Member Team R2R R2R Supporter R2R Excellence Award Partner Member

    Joined:
    Dec 25, 2009
    Messages:
    9,306
    Likes Received:
    1,760
    Location:
    Richmond, Va
    I don't see raising it slow and steady would be detrimental to SPS. In fact several people have raised it 2x's and even heard of one person raising it 4x's NSW. Justin Credable briefly talks about it during MACNA 2014. My levels at the moment are beyond what Salifert reads and corals look fine.
     
  5. TUSI

    TUSI Well-Known Member R2R Supporter Reef Spotlight Award Photo of the Month Award Reef Squad

    Joined:
    Oct 6, 2013
    Messages:
    1,923
    Likes Received:
    1,760
    Location:
    GARDEN CITY NY
    Good to know. if you dont mind sending me any link that talk about this i would really appriciated cause i was always under the impression that to high potasium is detrimental to corals.
     
  6. Randy Holmes-Farley

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

    Joined:
    Sep 5, 2014
    Messages:
    17,493
    Likes Received:
    6,092
    Location:
    Arlington, Massachusetts, United States
    I'm not familiar with the upper end of any of the available potassium kits.

    Are you intentionally trying to raise it higher, and if so, why?
     
  7. spspirate

    spspirate Tidepool Explorer Staff Member Team R2R R2R Supporter R2R Excellence Award Partner Member

    Joined:
    Dec 25, 2009
    Messages:
    9,306
    Likes Received:
    1,760
    Location:
    Richmond, Va
    Yes I would like to run my potassium at around 800 ppm for a while to see if there is a positive difference as stated above. I've heard of people doing this and the claims of great colors but do not have a test kit that will read anything that high............that's where I'm looking for input.
     
  8. Randy Holmes-Farley

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

    Joined:
    Sep 5, 2014
    Messages:
    17,493
    Likes Received:
    6,092
    Location:
    Arlington, Massachusetts, United States
    Assuming you start with normal levels, you can readily determine how much to dose to hit that level. That might just as accurate as using a kit. More accurate if you know your total volume well. :)

    FWIW, I have heard of folks with problems and none with advantages of overdosing potassium, but those aren't controlled studies.
     
  9. sundog101

    sundog101 Well-Known Member

    Joined:
    Sep 7, 2014
    Messages:
    459
    Likes Received:
    182
    I have the salifert which goes up to 470 and I haven't found one that goes much higher. I'd like to keep mine in the 500 range.

    Randy, would diluting the test water by half with rodi give half the result? So 500 diluted would be 250?

    I've also heard Justin mention something about "retitrating"
     
  10. spspirate

    spspirate Tidepool Explorer Staff Member Team R2R R2R Supporter R2R Excellence Award Partner Member

    Joined:
    Dec 25, 2009
    Messages:
    9,306
    Likes Received:
    1,760
    Location:
    Richmond, Va
    Good point
     
  11. Randy Holmes-Farley

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

    Joined:
    Sep 5, 2014
    Messages:
    17,493
    Likes Received:
    6,092
    Location:
    Arlington, Massachusetts, United States
    I'm not sure how important the salinity is for a potassium test accuracy. You can test that by taking some tank water, getting a result, and adding RO/DI to the tank water to see how the value drops, and if it drops by the dilution amount expected.
     
    spspirate likes this.
  12. sundog101

    sundog101 Well-Known Member

    Joined:
    Sep 7, 2014
    Messages:
    459
    Likes Received:
    182
    Alright, I just tested it. My potassium right now reads 400ppm (10 drops). I added 0.5ml of tank water and 0.5ml of ro/di water. It took 30 drops which would be 200ppm. The test shows the reading down to 250, but if 1 drop equals -10ppm, the result would be 200. So it seems to be right; keep in mind I only did a couple of tests through.
     
    Last edited: Mar 21, 2017
    spspirate likes this.
  13. Randy Holmes-Farley

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

    Joined:
    Sep 5, 2014
    Messages:
    17,493
    Likes Received:
    6,092
    Location:
    Arlington, Massachusetts, United States
    I didn't follow what you said, but if the test on the same total volume of water (which is half tank water and half RO/DI) gave half the potassium level, then you are good to go with dilution. :)
     
  14. sundog101

    sundog101 Well-Known Member

    Joined:
    Sep 7, 2014
    Messages:
    459
    Likes Received:
    182
    Yes that's a better way to word it :D
     

Share This Page

Loading...