This site is supported by the advertisements on it, please disable your AdBlocker so we can continue to provide you with the quality content you expect.
  1. We are after as many aquarium plant images that we can get, doing so will assist us in completing the aquarium plant database.

    https://barrreport.com/threads/aquatic-plant-images-wanted.14374/
    Dismiss Notice

Drop Checker reliability, under "ideal" measurement

Discussion in 'General Plant Topics' started by growitnow, Apr 10, 2009.

  1. growitnow

    growitnow Lifetime Charter Member
    Lifetime Member

    Joined:
    Mar 3, 2007
    Messages:
    137
    Likes Received:
    0
    Local Time:
    1:12 AM
    Hello,

    Drop checkers have become suspect in their ability to accurately reflect CO2 levels of the planted tank. As I understand it, the key issues are that CO2 levels

    *normally fluctuate throughout the day
    *fluctuate with variation in filter or powerhead capacity to evenly distribute CO2
    *and because of circulation issues, can be different at different locations of the tank

    So the problem is that a drop checker reading only reveals CO2 levels at that particular part of the tank, at that particular time of day, and with the distribution/circulation of water for that particular period of time (which will change over time as a function of filter flow, etc.).

    The issue seems not to be accuracy of drop checker measurement, but stability of actual CO2 levels to which the drop checker is sensitive. Have I got that right?

    So my question is - under circumstances where there is serious and equivalent distribution of current/flow throughout the tank (e.g., empty tank, multiple powerheads all possible directions run 24/7), is the drop checker reliable under these conditions?

    No one would run a tank this way, but if the answer is "yes, probably, kind of", then that suggests continued utility of the drop checker, under conditions where issues of flow are carefully addressed (the latter Tom has generously repeated for the hard of hearing, many times..). My interest is just trying to get a handle on what the key problems are, and how those problems might be approached - without having to return to similar problems of pH/KH charts.
     
    #1 growitnow, Apr 10, 2009
  2. ccLansman

    ccLansman Guru Class Expert

    Joined:
    Jan 22, 2008
    Messages:
    375
    Likes Received:
    0
    Local Time:
    1:12 AM
    I think in all reality the drop checker is completely pointless. Not only for the reasons stated above but also for the simple fact that if enough co2 is getting into the tank the plants will let you know... and if you are a few bps high, well its just going to be wasted any how with a drop checker or not... People should save their $$ and just work on getting the plants to respond by slowly adjusting co2.
    \
     
    #2 ccLansman, Apr 10, 2009
  3. Gerryd

    Gerryd Plant Guru Team
    Lifetime Member

    Joined:
    Sep 23, 2007
    Messages:
    5,624
    Likes Received:
    20
    Local Time:
    1:12 AM
    Growitnow,

    The real big issue with drop checkers is that they take time to react to the c02 content in the water. The lag is anywhere from 2 hours upwards. So when the checker is viewed, you are seeing what is was X time ago, not what it may be at the viewing time.

    All you really 'know' is that at some point in the past, your c02 was 'maybe' sufficient.......

    Only a c02 meter that reads the dissolved c02 gas will work to give real time measurements.

    They are 2K in price and thus not common.

    Still a checker is useful for the novice as they learn more about c02.....

    I use them every now and then just to see that the levels seem the same over time........
     
    #3 Gerryd, Apr 10, 2009
  4. Henry Hatch

    Henry Hatch Guru Class Expert

    Joined:
    Aug 31, 2006
    Messages:
    179
    Likes Received:
    0
    Local Time:
    1:12 AM
    I think that drop checkers have some value. For example I use the drop checker to determine the bottle change schedule for diy yeast. I observe when the level starts to drop and use as that as a guide to determine when to change.

    Also I will move the drop checker to different locations in the tank to get some idea of how good my circulation is.

    Drop checkers are flawed, but not without some value.
     
    #4 Henry Hatch, Apr 11, 2009
  5. VaughnH

    VaughnH Lifetime Charter Member
    Lifetime Member

    Joined:
    Jan 24, 2005
    Messages:
    3,011
    Likes Received:
    94
    Local Time:
    1:12 AM
    Most of the inaccuracy with drop checkers is because they rely on the equation that relates CO2 concentration to pH and KH. The equation includes raising 10 to the pH power. So, tiny errors in pH make big errors in concentration of CO2. Then, there is the inherent problem of using a color to indicate the concentration of CO2, when it is hard to discriminate between the color corresponding to 6.4 pH and 6.8 pH - a big error band.

    The drop checker simply helps you to avoid being gun shy with the CO2 bubble rate, fearing that every twitch of a fish indicates CO2 poisoning. That fear kept many of us from getting more than 5-10 ppm of CO2 in the water, thinking we were way above that. Now, we can use the drop checker and know that a "twitching" fish isn't related to the CO2 when the drop checker is still blue. Treat the drop checker as an aid to learning.
     
    #5 VaughnH, Apr 11, 2009
(You must log in or sign up to post here.)
Loading...
Similar Threads - Drop Checker reliability
  1. Gabe Hayes

    Diy 4dkh Dropchecker Solution

    Gabe Hayes, Jul 11, 2019, in forum: CO2 Enrichment
    Replies:
    2
    Views:
    813
    Gabe Hayes
    Jul 12, 2019
  2. Corne

    Green dropchecker in the night?

    Corne, Apr 15, 2017, in forum: CO2 Enrichment
    Replies:
    2
    Views:
    541
    Tom Barr
    Apr 15, 2017
  3. Planterson

    Co2 As it relates to the drop checker

    Planterson, Sep 12, 2015, in forum: CO2 Enrichment
    Replies:
    7
    Views:
    451
    Planterson
    Sep 14, 2015
  4. heel4you

    Which drop checker should I choose?

    heel4you, Mar 14, 2015, in forum: General Plant Topics
    Replies:
    5
    Views:
    379
    heel4you
    Mar 15, 2015
  5. DLoja

    Best Drop Checker Method

    DLoja, Mar 14, 2015, in forum: CO2 Enrichment
    Replies:
    11
    Views:
    1,396
    Solcielo lawrencia
    Mar 19, 2015

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Accept Learn More...
    Dismiss Notice