Fritz pond ammonia remover is a true complete water conditioner that not only neutralizes toxic ammonia but also the chlorine & chloramines found in tap water. Ammonia poisoning is the most common killer of pond fish. Ammonia is produced by decomposing plants, algae, fish waste, and uneaten food. Fritz pond ammonia remover will not alter pH or deplete oxygen levels. Fritz pond ammonia remover is extremely safe even when overdosed.