Seachem Prime is used for water treatment, aiding in the complete detoxification of heavy and toxic metals found in tap water. Prime is a complete and concentrated conditioner for fresh and salt water. Removes chlorine, chloradaine and neutralizes ammonia, converting ammonia into a safe, non-toxic form that is easily removed by the aquarium's biofilter. The conditioner can be used during cycling to relieve ammonia/nitrite toxicity. It will also detoxify all heavy metals found in tap water at typical concentration levels.