Fritz complete is a concentrated, one-step, full-spectrum water conditioner that detoxifies chlorine, chloramine, ammonia, nitrite and nitrate. Safe to use in fresh and saltwater, including reef and planted aquariums. Use when setting up new aquariums, performing water changes or to quickly alleviate high ammonia, nitrite and nitrate. Directions: use 1 tsp (5 ml) per 50 U.S. Gallons (189 L) / 2 drops per Gallon (3.78 L).