Nitrites (NO2) are among the most harmful...
Nitrites (NO2) are among the most harmful dissolved compounds, they are extremely toxic. Nitrite (NO2) should never be present in the water of your aquarium except when it is started. But at no time should the animals in your aquarium be exposed to nitrites.
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Salifert Nitrite Profi-Test
The temperature of the water has to be above 18C or 64F otherwise the complete color will not develop within 60 seconds. If the water temperature is below the above mentioned values then allow the water in the test tube to acclimate at room temperature for 10 minutes prior to testing.
KEEP OUT OF REACH OF CHILDREN. Not for consumption. If swallowed contact a physician immediately. In case of contact with skin wash with plenty of water. In case of contact with eyes, wash eyes immediately with of water and contact a physician immediately.
After your aquarium or garden pond has cycled you will need a much higher sensitivity. This is easily accomplished by looking through the side when comparing colors. Hole the test tube with its side against a white piece of color chart. The readings have to be divided by 10. In this way you will be able to detect 0.01 ppm as nitrite or 0.003 ppm as nitrite-nitrogen easily.