| 摘要 |
A filter device where filter sand is less likely to clog and unevenness of the sand is less likely to occur. The device enables washing and rinsing of filter material in a short time. In a filter vessel (2), a screw conveyor (32) is provided in a wash vessel (38) hanged from the upper side. Space (52) is formed between a filter bed (4) and a metallic net (50) that are vertically separated. A filter material (14) is provided above the metal net (50), and filter material (54) having a larger grain size than the filter material (14) is provided in the space (52). Strainers (12) are provided in the filter bed (4). A wash water jet pipe (58) is installed on the outer wall of the space (52). After the screw conveyor (32) is rotated and the filter material (14) is washed, wash water is jetted from a clean water outlet pipe (46) and the wash water jet pipe (58), and muddy substances are discharged from a raw water inlet pipe (56).
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