This Bulk GFO Phosphate Reducer Bayoxide is an ultra-pure virgin granulated ferric oxide designed to effectively reduce phosphate levels in both saltwater and freshwater aquariums. By removing phosphates, a key nutrient for nuisance algae growth, this product helps prevent the onset of unwanted algae blooms and ensures healthier coral skeletons by facilitating calcium formation. Prior to use, it's recommended to give the GFO a quick rinse with reverse osmosis water to remove any dust or fine particles that may interfere with performance.