AmGuard from Seachem rapidly and efficiently removes toxic free ammonia from your aquarium. It is perfectly safe to use during tank cycling and is ideal for treating emergency situations. AmGuard is the strongest liquid ammonia binder on the market. It works within minutes to detoxify free ammonia, and it will not degrade for up to forty-eight hours., AmGuard converts ammonia into a safe, non-toxic form that is readily removed by your tank's biofilter. Ammonia can exist in two forms: free and ionized. It is only the free form that is toxic. Traditional ammonia test kits convert all ammonia to free ammonia by raising pH to 12 0- 14; at this pH AmGuard will not function and produce a false positive reading as a result. For long term ammonia control, use Seachem Stability and Matrix. Use Ammonia Alert or MultiTest. AmGuard also removes chlorine and chloramines. It does not alter the pH of your water. Ammonia. Seachem offers a wide range of solutions to any aquarium problem.