[SpeedEuphoria]

Orlando, I'm a newb at this stuff so just for conformation.

http://www.greenleafaquariums.com/co2-drop-checkers/kh-standard.html

that's the water that goes into the DC correct? Then just add 2-3 drops of bromo blue.

So I guess my thing is, its only 37ml, how much does the DC hold? As it seems that this will only last a short time. Do you sell larger quantities of 4dKH water?

 

[SpeedEuphoria]

On the white background, I have read a few use a plastic cup, white on the inside. Cut the cup in 1/2 or 1/3 lengthwise and you can even attach it to a stick of some kind. Then lower that in the tank behind the DC to see the color better.