RID-ALL aanti chlorine creates natural by neutrazing fresh tep water chlorine content which is very harmful to aquarium fishes it also removes haavy meals such as lead copper zinc arsenic mercury and cyanide found in water collected from springs and lakes it provides a safety screen for the delicate mucus membranes on scales and gills against infection it will reduce stress in fish every time water is added or changed 
anti chlorine should be used whenever fresh tap water is added to the aquarium