Kolar Filtration GFO - (6) 1 pound bags of Phosphate Removal Media for Salt Water Reef Aquariums and Coral Health HIGH QUALITY: High quality ultra-pure virgin GFO with reduced fines. Removes phosphate and silicates CONVENIENT BUCKET: Save money with bulk one gallon bucket size holding 4 lbs of Media REDUCES ALGAE: Prevents alga from coming back by removing the main food source- phosphate SAFE FOR ALL AQUARIUMS: Works in salt water & freshwater aquariums, ponds, and more Bayoxide is a registered trademark of LANXESS GmbH