PS TRADER [R] 500 ml Anti-Chorine for Aquarium only, Anti-chlorine creates natural water conditions instantly by neutralizing fresh tap water's chlorine content which is very harmful to aquarium fishes it also removes Heavy metals such as lead, copper, zinc, and arsenic, and mercury and cyanide found in water collected from spring and lakes, it provides a safety screen for changed anti-chlorine should be used wherever fresh tap water is added into the  Aquatium Use 5 ml For 25 Liter