The complete and concentrated conditioner for both fresh and salt water. It should be the first choice conditioner when setting up a new tank adding or changing water. Prime™ removes chlorine chloramine and ammonia. Prime™ converts ammonia into a safe non-toxic form that is readily removed by the tank’s biofilter. Prime™ may be used during tank cycling to alleviate ammonia/nitrite toxicity. Prime™ detoxifies nitrite and nitrate allowing the biofilter to more efficiently remove them. Prime™ also promotes the production and regeneration of the natural slime coat. Unlike competing products Prime™ is non-acidic and will not impact pH. Prime™ will not over-activate skimmers. It will also detoxify any heavy metals found in the tap water at typical concentration levels. Use at start-up and whenever adding or replacing water. A 100 mL bottle treats over 1000 gallons much more than competing products..Marine and freshwater.