YFS Bulk GFO Granular Ferric Oxide is a natural phosphate-removing media commonly used in aquariums. GFO works in all types of saltwater and freshwater aquariums. Used to help control algae outbreaks. Can be used in either a media bag or media reactors.
In granular form appx. 1/4" in size
The one pound size is packaged in a resealable standup pouch. The 5, 10 and 15 pound sizes are packaged in a bulk plastic bag.