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We purchase our Granular Ferric Oxide (GFO) directly from the manufacturer allowing us to offer it for a fraction of the cost. This is the same material imported from Germany for the aquarium industry. GFO is primarily used to remove phosphates from your aquarium but will remove arsenic and heavy metals as well. By removing phosphates GFO aids in algae control and will encourage faster coral growth. GFO can be used in an inexpensive reactor or a filter sock placed in a high flow area of the tank. For more information about GFO please click HERE |