Aquascape BioBalls are ideal for use as a biological filter media, providing a textured surface area for beneficial bacteria to colonize. Each ball offers 19 square inches of surface area and every box contains 100 BioBalls plus a media bag with drawstring. Aquascape BioBalls use a paddle wheel design which breaks water-flow, helping to de-gas the water and maximize dissolved oxygen levels. Their compact size allows for placement into smaller spaces, while the center channel allows the balls to be strung together, making cleaning quick and simple. Aquascape BioBalls do not break down like some traditional biological media options, providing years of trouble-free use without replacement. Aquascape is passionate about the products we produce, providing unique products, designs, and features that stand above the competition.