API® AMMO LOCK ammonia detoxifier is proven to convert poisonous ammonia into a non-toxic form. AMMO LOCK ammonia detoxifier works instantly in both fresh and saltwater aquariums, removing ammonia, chlorine, and chloramines. Note that if your aquarium tests positive for ammonia, it is necessary to perform a partial water change first, and then neutralize the ammonia. AMMO LOCK ammonia detoxifier is now detectable by API Ammonia Test Kits. Available Sizes: 4 oz, 8 oz & 16 oz