Prime by Seacheam is a concentrated aquarium water conditioner for Marine and Freshwater fish tanks. It effectively removes chlorine and chloramine whist dexotifying ammonia, nitrate and nitrite, allowing the biofilter to remove these elements more effectively. Prime will also detoxify heavy metals that are found in tap water which are harmful to fish. It is a non acidic formula and will therefore not affect pH levels or over activate your skimmer.