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Coralvue Bulk GFO Phosphate Adsorption Media 640oz (5 gallon bucket) by volume

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Phosphate Adsorption Media for fresh and marine aquariums
Phosphate Adsorption Media for Fresh and Marine Aquariums
Granular Ferric Oxide commonly refereed to as GFO ideally suited for filtering out phosphate from the water column which promotes better coral growth and helps prevent algae outbreaks. This medias porous high surface area is not only ideal for binding phosphate but also silicate, arsenic and other water-staining compounds.

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