| 摘要 |
A cleansing tank 38 and a screw conveyor 32 are removably mounted to a mounting opening 22 of a filtration tank 2 . When the cleansing tank 38 and the screw conveyor 32 are to be removed, they can be extracted to the exterior of the filtration tank 2 , by detaching a base 28 , which axially supports the screw conveyor 32 , from a rim 24 . Purified water is backwashed through a purified water discharge pipe 60 when the cleansing tank 38 and the screw conveyor 32 are extracted and inserted through the mounting opening 22 . This causes filtration media 14 to float, thereby reducing the resistance thereof.
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