Premier Is A Conditioner Specifically Designed For The Planted Aquarium. It Removes Chlorine And Chloramines. Premier Is Non-Acidic And Will Not Impact Ph. Key Features: Premium Aquavitro Line Does Not Contain Sodium Concentrated Solution Of Potassium Thiosulphate Which Removes Chlorine And Chloramines Directions: Use 5Ml Of Premier For Every 190L (50 Us Gallons) Of Water. Premier May Be Added To The Aquarium Directly, But It Is Best If Added To New Water First. If Adding Directly To Aquarium, Base Dose On Aquarium Volume. For Exceptionally High Chloramines Concentrations, A Double Dose May Be Used.