Sodium thiosulfate, sodium carbonate, water.
Use when adding tap water to new and existing aquariums and ponds. For best results, mix Tap Water Dechlorinator with tap water before adding to aquarium or pond. If also adding a Bacteria Starter such as Top Fin Bacteria Supplement (sold separately), allow dechlorinator to circulate in aquarium for at least 15 minutes before adding the bacteria product.
Use 1 mL for each 10 U.S. gallons (38 L).
Product of USA.