Toxic nitrite is produced by nitrifying bacteria in the biological filter as it breaks down ammonia. This kit tests for harmful nitrite and measures levels from 0 to 5.0 ppm.

Mars Fishcare is an industry leading manufacturer and international supplier of a complete line of aquarium and pond products. We manufacture and sell hundreds of products across many different product categories, including Aquarium and Pond Treatments, Aquarium Equipment, Aquariums and Fish Nutrition. We produce just about everything to meet the needs of aquarium owners and pond keepers.