AmGuard™ is a premium narrow spectrum conditioner for the rapid and safe removal of ammonia from aquarium water or shipping containers. AmGuard™ does not work by lowering the pH or forming a temporary ionic complex with ammonia, but instead, forms an irreversible compound, does not alter pH, and promotes the proliferation of nitrifying bacteria. It is a remarkably versatile product that is ideal for emergencies, establishing new tanks, and receiving fish shipments. It is compatible with Prime™ and Safe™. A 10 g vial treats 200 gallons at 1 ppm of ammonia. Use our MultiTest: Free & Total Ammonia™ test kit to check ammonia. Marine and freshwater. 20 g bottle.