API Nitrite (NO₂) Test Kit measures nitrite from 0 to 5 ppm in freshwater and saltwater aquariums. Nitrite is a toxic intermediate in the aquarium nitrogen cycle; the test helps monitor new tanks and potential biological filtration problems.
Package and Directions
One liquid nitrite reagent bottle, capped test tube, instructions and comparison color card.
Use the sample volume, number of reagent drops, mixing and color-development time printed on the current API kit instructions.
Compare the finished sample with the appropriate color card, using adequate lighting.
Important Testing Notes
Check nitrite regularly while establishing a biofilter and following fish additions or filtration problems. A reading of 0 ppm is the normal target for a cycled aquarium. Never pour used reagent water back into the tank. Rinse and dry equipment after testing and check reagent expiration dates.
