Some notes and negatives re the Hanna hi784 checker.
I re-read the full instructions and some things caught my attention.
1st off this is testing total ammonia NH3/NH4. To get the “toxic” ammonia, you need to do some math to calculate the unionized toxic ammonia
Using this formula, my “toxic” ammonia came out to be .007 nh3.
The api test kits that almost always show zero are probably right as well as they are not nearly as sensitive as this version of the Hanna checker.
API kits goes from 0ppm to 0.25, 0.50, 1.0, 2.0, 4.0, and 8.0. Even at the most minute, a pretty big margin for the reading.
And im guessing most people if they ran their sample through the Hanna, it would likely be under the .25 ppm reading so it would show as zero on api’s chart.
And I don’t know this for certain, but I suspect that when most people are talking about dangerous levels of ammonia, they should be meaning the free ammonia reading but are probably mixing it up with the nh3/nh4 total ammonia reading.
Long story short.. I should probably just stop testing my ammonia as I think many have already said on this forum in other posts.
What lead me down this path was my nitrates reading zero,a be caused a bit of a panick on my part.