The Aquascape Bio Falls Media Net is a durable mesh bag used to store and secure biological filtration media for ponds and water gardens. This bag is made of strong nylon material with a drawstring to keep the bio media secure in your pond filtration system. Works great with Aquascape Bio Balls Filter Media # 98464 (100 pieces). Aquascape is passionate about ponds, water features and gardening, providing unique products, designs, and features that stand above the competition.