Prime is the premium, concentrated water conditioner for both fresh and saltwater. It removes chlorine, chloramine, and detoxifies ammonia. Prime also detoxifies nitrite and nitrate and can be used while cycling to put down spikes in ammonia or nitrite. It also detoxifies heavy metals at typical tap water concentrations. Prime is non-acidic and won't affect pH. Super concentrated - 1ml for each 10 gallons or two drops per gallon.