Nitrite develops when beneficial bacteria break down ammonia. This becomes extremely toxic to fish when high levels of nitrite persist in the aquarium for more than a week. Test weekly.

Kit includes:

• 1 x NO2/NO3 (17 ml)
• 1 x NO2/NO3 (10 ml)
• 1 x Pipette
• 1 x Glass test tube 
• Instruction booklet
• 75 tests