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Easily and Accurately Measure the Water Parameters Ammonia, being a source of nitrogen is also a nutrient for Algae and other forms of plant life and thus contributes to overloading of natural systems and cause pollution. Directions for Use: 1)Take 25 ml of the sample in the test jar, provided. 2)Add 25 drops* of NH1. Mix thoroughly. Wait for ten minutes. 3)Transfer the content in small comparator tube supplied here. 4)Read the ppm Ammonium as follows : a)Place the comparator tube on the small inner (white) circle, on the colour comparison chart. b)View from the top of the comparator tube to compare the sample colour and the colour