Makes tap water safe for fish by removing ammonia, chloramine and chlorine. Made exclusively for PetSmart. Features:Removes ammonia, chloramine and chlorineSafe for fish and plants when used as directedCan be used for regular water changes, when adding fish or water or when high ammonia is present in pond waterUser ever 3-4 weeks to prevent ammonia buildup and fish stressInstructions: Use 1 oz of Top Fin Ammonia Remover for each 100 gallons to be treated. Distribute evenly around circumference of pond. 16fl oz