Can anyone help?
I have noticed on my test kit that they mention NO2-N but also NO2. The value of NO2 is roughly 3 times that of NO2-N. The colour chart only indicates Nitrite NO2.
Which one should I use? The level on right or left side of table
Example: Let's say you do the test and you read 1.0 from the colour chart. Which result on the chart below do you use?
The '1.0' on left side is high, but '1.0' on right side is tolerable