Contains one (1) API FURAN-2 Fish Powder Medication 30-Ounce Bulk Box Treats a wide variety of bacterial fish infections. Fast-acting. For use in fresh and saltwater aquariums only. Use when symptoms of bacterial diseases appear. API FURAN-2 treats a variety of bacterial infections in fish, such as open red sores, gill disease, hemorrhagic septicemia, eye cloud, body slime, and fin & tail rot. For use in fresh and saltwater aquariums. Dose according to directions on product label and use accordingly. 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. DIRECTIONS FOR USE: For each 10 gallons of water, empty one packet directly into aquarium. Repeat dose after 24 hours. Wait another 24 hours then change 25% of the aquarium water. Repeat this treatment for a second time, for a total of 4 doses. Then make a final 25% water change and add fresh activated carbon or replace filter cartridge.