Nitrite is produced in the tank from fish waste, uneaten food, and through oxidizing bacteria in your tank's natural cycle as ammonia breaks down. Low nitrite levels inhibit respiration and suppress the immune system, while high levels cause fish suffocation.

The API® Nitrite Test Kit quickly and accurately reads nitrite levels in your tank, testing ranges from 0 to 5 parts per million.

Contains 180 tests and includes one test solution, easy-to-read instructions, a glass test tube, and a color chart.