Since running my CO2
, I have constantly checked pH and KH, morning and night to work out the levels I have in my tank.
This has resulted in me burning through 2 KH kits, and I'm now on my third. (pH result derived from pH meter).
Each time I have bought a different KH kit, and each time I get different results!
First I had the Tetra brand........ gave a KH of 11.2 - 11.5
Then I had the Hagen brand...... gave a KH of 10.0 - 10.5
Now I have the Salifert brand.... gives a KH of 13.5
With my pH of 6.83, I could theoretically have a CO2
level anywhere from 41.628ppm to 56.198ppm!
Is there a way to test the accuracy of KH kits? Does anyone have any recommendations on which one I should place most trust in?
As a side note.... I know they all use a bicarbonate indicator at specific molar solutions (to give 1dGH per drop ratio, or 10mg/l CaCO3
per 1 drop ratio) as the reagent.... is there anywhere I could get hold of a bulk supply of this reagent to save me a bit of cash, as with my KH as high as it is, I tend to use quite a few drops!