Aquarium Pharmaceuticals Pond Care Ammo Lock Works Instantly To Detoxify Deadly Ammonia, And Makes Tap Water Safe For The Pond. Pond Care Ammo Lock neutralizes toxic chlorine found in tap water. One dose of Ammo Lock will neutralize 7.0 ppm of chlorine. Ammo Lock works fast to detoxify ammonia found in fish waste and uneaten food. Use as directed every time tap water is added to the pond. 16 Oz. treats 1,920 Gallons.