Premium Grade Liquid Filter Biologically breaks down food residues, ammonia, and nitrite Provides a stable area for beneficial bacteria that purify the water Creates a biologically active living environment Dangerous toxic substances such as ammonia and nitrite are constantly formed in aquarium water. Sera Bio Nitrivec, a product from Sera technology, contains millions of purification bacteria that help quickly and reliably establish a stable biological balance, ensuring the continuous breakdown of toxic substances. The added volcanic mineral rocks remove pollutants, effectively bind turbidity, and provide a suitable stabilization area for purification bacteria. For healthy, clear, and biologically active water. Allows fish to be added after 24 hours when used with Sera Aquatan! Sufficient volume for: 50 ml 125 liters / 33 US gallons 100 ml 250 liters / 66 US gallons 250 ml 625 liters / 165 US gallons 500 ml 1,250 liters / 330 US gallons 2,500 ml 6,250 liters / 1,650 US gallons 5,000 ml 12,500 liters / 3,300 US gallons