Noob needs help with API KH/GH test. - The Planted Tank Forum

 
LinkBack Thread Tools Display Modes
post #1 of 9 (permalink) Old 06-29-2012, 07:45 PM Thread Starter
Algae Grower
 
Blah4Life's Avatar
 
Join Date: Jan 2012
Location: New York, NY
Posts: 65
Noob needs help with API KH/GH test.

Hello!

Do I add the total number of drops from the KH test to the number needed in the GH test and THEN consult the conversion chart with the grand total of drops used?

I'm really confused with how I come up with the value for each using the chart. Maybe I'm either stupid or totally over thinking it...
Blah4Life is offline  
Sponsored Links
Advertisement
 
post #2 of 9 (permalink) Old 06-29-2012, 08:19 PM
Planted Tank Enthusiast
 
Join Date: Jan 2012
Location: New York
Posts: 748
I believe the two tests are totally separate. Just count the number of drops until the color changes. But that's from memory, haven't done it in a while.

NIKON pimp #017
Sump pimp #014
nvladik is offline  
post #3 of 9 (permalink) Old 06-29-2012, 10:32 PM Thread Starter
Algae Grower
 
Blah4Life's Avatar
 
Join Date: Jan 2012
Location: New York, NY
Posts: 65
That would make sense. I guess I'm just a little confused by the conversion chart they provide, I guess.
Blah4Life is offline  
post #4 of 9 (permalink) Old 06-30-2012, 10:24 AM
Wannabe Guru
 
pandamonium's Avatar
 
Join Date: May 2012
Location: San Francisco, CA
Posts: 1,078
from what i understand you count the total number of drops from the first one you put in until the color change happens. when i did that i got reasonable numbers that were consistent with the numbers put out in my water quality report. i guess its some kinda of titration?
pandamonium is offline  
post #5 of 9 (permalink) Old 06-30-2012, 11:31 AM
Planted Tank Enthusiast
 
lipadj46's Avatar
 
Join Date: Apr 2011
Location: NY
Posts: 939
You count the number of drops and that is your GH or KH in degrees hardness. If you want ppm multiply the degrees hardness by 17.
lipadj46 is offline  
post #6 of 9 (permalink) Old 06-30-2012, 11:41 AM
Algae Grower
 
Alastair-T's Avatar
 
Join Date: Jun 2011
Location: england
Posts: 93
With the gh, it's however many drops it takes after each shake to turn your sample from yellow to green, so say 6 drops gives you a gh of 6. Same with the kh. The solution needs to go yellow


Sent from my iPhone using Tapatalk
Alastair-T is offline  
post #7 of 9 (permalink) Old 06-30-2012, 02:30 PM
Planted Tank Guru
 
Join Date: Jan 2010
Location: Contra Costa CA
Posts: 11,721
Ditto: Just count the drops.

I find the color change hard to see in the GH test. Make sure you are looking at it in good light, but without anything green nearby to reflect into the test tube.
The KH test (Blue/Yellow) is very obvious.

If you want to fine tune it you can double your sample size (use 10 ml of water) then you can figure it down to about .5 degrees. I am not sure the test is accurate beyond that though. I do that if the color change happens at just one drop. I do not bother if the color change happens at any higher level. In fact I do the opposite. Use half dose of water (2.5 ml) and call each drop 2 degrees.
Diana is offline  
post #8 of 9 (permalink) Old 06-30-2012, 09:48 PM
Planted Tank Guru
 
Monster Fish's Avatar
 
Join Date: Mar 2011
Location: Queens, NY
Posts: 3,282
If your water is very soft, it might take only one or two drops for the color of the solution to change. In Queens, I've measured the tap to have a GH of about 1-2 and the KH at the same value. I've used Diana's method of using a 10 ml sample size, but instead of using the test tubes, I used a white paper cup since it's easier to see the color change. The change in color for the solutions is also very faint, at least in my experience. For example, with the GH it took only two drops of the solution to change the water from orange to light green using a 10 ml sample.

RAOK Club #77|The Fraternity of Dirt #112
Monster Fish is offline  
post #9 of 9 (permalink) Old 06-30-2012, 10:13 PM
Planted Tank Guru
 
Join Date: Jan 2010
Location: Contra Costa CA
Posts: 11,721
I will try the white cup idea. I am having a hard time seeing the change in the test tube, and most of the tanks have a GH of about 4-6 degrees. (Mostly 2-3 drops using 2.5ml of water as the sample)
Diana is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome