AMMONIA TEST KITS [SERA] Ammonium and ammonia mainly arise from fish waste. They are converted into each other depending on the pH value. While ammonium is mostly harmless, ammonia is toxic to fish. Most of the problems in fish or shrimp mortality is relating to the high ammonia content in the culture system. Therefore, it is very important for YOU TO MEASURE YOUR AMMONIA frequently. Simple 5 minutes test to measure and monitor ammonia levels in fresh and marine water. Comes with instruction videos (https://youtu.be/zeCUJDYtZFs) The sera NH4/NH3-Test allows monitoring the total concentration of both (the actual ammonia level can be calculated according to the pH value the using the included chart). Sufficient for approx. 60 measurements.