Kolar Filtration GFO - 4 lb Bucket Bulk GFO Phosphate Removal Media Aquarium filter Algae Reducer &hellip; HIGH QUALITY: High quality ultra-pure virgin GFO with reduced fines. Removes phosphate in water REDUCES ALGAE: Kills algae and prevents them from coming back by removing their food source, phosphate RINSE BEFORE USE: Give quick rinse to remove any dust from shipping SAFE FOR ALL AQUARIUMS: Works in salt water & freshwater aquariums, ponds, and more Bayoxide is a registered trademark of LANXESS GmbH