API AMMO-CHIPS continuously works to remove toxic aquarium ammonia, the #1 killer of tropical fish. May be used in any aquarium filter, and may be reused after being recharged in a salt solution. For use in freshwater aquariums and ornamental ponds. Use according to directions on product packaging. With API Aquarium products, it’s easy to keep a beautiful saltwater, freshwater or reef aquarium. For over 50 years, API has been creating innovative, research-driven solutions that make it easier to care for your fish and aquarium. API Aquarium Treatment Supplies are designed to work in conjunction with each other to provide best results to control algae, promote healthy bacterial growth and help control and cure fish diseases and conditions such as ich and fin rot. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. With API, you can spend more time admiring your fish, and less time scrubbing your tank. Make sure to use all products as directed in order to ensure the best results. GTIN:00017163048794. Free Shipping in the USA!