PROBLEM TO BE SOLVED: To provide a filtration device which is excellent in filtration performance and also eliminates contaminants at the lower side of the filtration device.SOLUTION: The inside of a filtration case is partitioned into upper and lower filtration chambers 61, 65 by a partitioning plate 3 having a water-passing hole 30. A drain pipe 4 is provided ranging from the bottom wall of the filtration case to the upper part of the filtration case, and a water-passing hole 46 communicating with the lower filtration chamber 65 is formed at the lower part of the drain pipe 4. Filtration materials 62, 66 are stored in the upper and lower filtration chambers 61, 65. When air bubbles are generated from air bubble generating means 5 inside the drainage pipe, water sucked into the upper filtration chamber 61 from a water suction hole 20 at the upper part of the filtration case passes through the filtration material 62, a partition-plate water-passing hole 30, the filtration material 66 in the lower filtration chamber 65, the pipe water-passing hole 46 and the drain pipe 4, and is drained from the tip end of the pipe, on the other hand, water sucked into the lower filtration chamber 65 through a bottom-part water suction hole 10 at the bottom part of the filtration case passes through the filtration material 66, the pipe water-passing hole 46 and the drain pipe 4, and is drained from the tip end of the pipe.COPYRIGHT: (C)2014,JPO&INPIT【課題】濾過性能に優れ、濾過装置下側の汚染物も除去できる濾過装置を提供する。【解決手段】濾過ケース内が、通水孔30を有する隔板3により上下の濾過室61,65に仕切られる。濾過ケース底壁から濾過ケース上方にかけて排水パイプ4が設けられ、排水パイプ4の下部に下部濾過室65に連通する通水孔46が形成される。上下の濾過室61,65に濾過材62,66が収容される。排水パイプ内の気泡発生手段5から気泡を発生させると、濾過ケース上部の吸水孔20から上部濾過室61に吸い込まれた水が濾過材62、隔板通水孔30、下部濾過室65の濾過材66、パイプ通水孔46および排水パイプ4を通ってパイプ先端から排出される一方、濾過ケース底部の底部吸水孔10から下部濾過室65に吸い込まれた水が濾過材66、パイプ通水孔46および排水パイプ5を通ってパイプ先端から排出される。【選択図】図4A
