Specifically designed for use with water gardens, koi ponds and aquaponics, EasyPro PBF pressurized bead filters offer superior mechanical and biological filtration for clean, clear, healthy pond water. The Ultimate Tube Media used in these filters has a large surface area allowing for massive amounts of beneficial bacteria to colonize in these filters. These beneficial bacteria help break down toxic ammonia and create a healthier environment for koi, goldfish and other aquatic life. With their small footprint, PBF Bead Filters are easy to hide for maximum pond enjoyment