sera bio nitrivec®, a sera biotechnology product, breaks down ammonium and nitrite due to the purification bacteria it contains. The included mineralic volcanic rock removes pollutants, effectively binds turbidities and provides settling space for the purification bacteria. The volcanic rock contains calcium, potassium and magnesium - indispensable minerals that are constantly consumed in an aquarium. For healthy, clear and biologically active water. Allows adding fish after only 24 hours! Information for use Size Item No. 100 ml 03740 250 ml 03750 500 ml 03760