Anions cations fast bind in the water, this powder qualifiers the water. Adding the Powder in fresh or saline water in an aquarium or aglass container planted waterbeds can purify the water, But it does not hurt aquatic plant and Animals. You amy not change the water for the aquarium Until at least one Month after adding this powder regularly adding it can Mater the water clear and Virid. Magic Powder has pack of 5 Pkts.