I looked at my test kit today and noticed that I’ve lost the directions for my KH and GH (Tetra/Laborett) test kits. I know that they are titration style kits but I can’t remember if the drops stand for one degree of hardness each or what. (I used 5 ml of water for each test) Does anyone else use these kits?
Thanks
Heather

I use the KH kit. One drop = 1 dKH. Count drops until the solution turns yellow.

I use Nutrafin/Hagen kit not sure if it counts the same way.
KH:
Add and count drops to 5ml untill water turns from blue to yellow, multiply by 10 to get PPM.

GH:
Add and count drops to 5ml untill water turns from pink to purple, multiply drops by 20 to get PPM.

On mine, you add 1 drop of KH until the solution turns yellow(1 drop = 1dkH) and for the GH its the same, except the solution will turn green.

I have used the Tetra kits.

For KH;
You are looking for a colour change from Blue to Yellow
Using 5ml aquarium water (standard) sample... 1 drop of reagent = 1 degrees of German Harndess (dGH).
Using 10ml aquarium water sample... 1 drop of reagnet = 0.5 degrees of German Hardness (dGH)

For GH;
You are looking for a colour change from Red to Green
Using 5ml aquarium water (standard) sample... 1 drop of reagent = 1 degrees of German Harndess (dGH).
Using 10ml aquarium water sample... 1 drop of reagnet = 0.5 degrees of German Hardness (dGH)



(p.s. I now use the Hagen kit 75sausage. It measures the hardness as mg/l of CaCO3, which you must multiply by 0.056 to convert to dGH.)

Thanks for the help, I now realize I have a serious problem with water quality.

What have you discovered?
Things aren't always what they at first seem.