Oase Biosmart Gravity Pond FilterProduct Details UPC 706759569309 Manufacturer Part No 56930 Bullet1 Biological filtration stage water is channeled through a series of foam filters that allow settling of beneficial bacteria Bullet2 Multi stage mechanical and biological filtration system in a compact package Key Features Biological filtration stage water is channeled through a series of foam filters that allow settling of beneficial bacteria Description Biosmart Filter 10000 1