1.Remove one test strip from the container and replace the lid.
2.Dip the test strip into the solution being tested for 1 second.
3.Remove test strip, and shake off excess water.
4.Compare strip to the color chart after 5 seconds. Do not wait more than 10 seconds to compare to the color chart.
The test strip works by using two pads in the test pad “sandwich” – the first pad creates an alkaline environment which converts all of the ammonia/ammonium present to ammonia. The second pad employs a hydrophobic material and indicators to detect the ammonia present.
IMPORTANT NOTE: The color chart reads as ‘ppm ammonia-nitrogen’, not as ppm ammonia. As a result, a reading of 100 ppm on the color chart of ammonia-nitrate is equivalent to 122 ppm as ammonia.