Originally Posted by Kramer
After reading some threads, I want to get a drop checker. Also, my LFS
(big als) sells the Red Sea CO2
Indicator. This is a drop checker? And I was wondering if anyone knows at what level is it calibrated to indicate a good co2
level? Also can I change the reference solution in it and use the method given in the sticky?
I use the Red Sea one and don't have any problems with it.
You can get certified KH
I ran a KH
test on the KH
standard and it showed up as 4 just as it should have, but I have never checked the difference between pH/KH
and the drop checker.
Even if my aquarium didn't have anything that would distort the results, you need a more accurate test kit to be able to measure CO2
effectively. ie having a KH
of 4 in your tank means it's between 3 and 5. It doesn't mean it is exactly 4.
Lets just say my pH kit is 100% accurate, if I use the pH/KH
charts and knowing that my KH
is between 3 and 5 I would end up with:
of 22.6 is I use a KH
of 3 and a CO2
of 37.7 is my KH
That's a 15 PPM
difference. Quite a margin of error. If I were to take out the KH
error, my error margin decreases dramatically. This is the main reason for using a drop checker and a certified standard. I know, within a small percentage of error, what my CO2
There is no reason for me to check the KH
/pH vs drop checker due to the wide band of the KH
test kit. (Granted you are still using the KH
/pH chart with the drop checker)