H2O Neutralizer • Neutralizes Chlorine • Neutralizes ammonia NH3 • Neutralizes nitrite NO2 • Neutralizes nitrate NO3 • Will not affect pH • Super concentrated formula For best results, add H2O Neutralizer to tap water before adding water to your pond. Use 1 tsp (5 ml) per 50 U.S. gallons (189 L). Each cup treats 2,400 gallons. If treating pond for ammonia, nitrite or nitrate, base dose on pond volume. For extremely high levels of chloramine or nitrite, dosage can be repeated or increased up to 5x within a 24-hour period. DO NOT OVERDOSE. A sulfur odor is normal and dissipates rapidly after use. In certain rare conditions and in low oxygen environments, this product may reduce dissolved oxygen levels. Ensure there is adequate circulation/aeration before adding. This product will affect the accuracy of Nessler-type ammonia test kits and Winkler-type oxygen test kits. Salicylate ammonia test kits are recommended. 16 oz Treats 4,800 gallons 32 oz Treats 9,900 gallons 128 oz Treats 38,400 gallons.