| 摘要 |
<p>One embodiment of the present invention is a porous filter column as a cylindrical shape column having a bottom, including: an outlet at the bottom unit which holds a porous filter on the bottom unit; and, a hollow member which is placed on the porous filter, wherein the hollow member includes a hollow unit which is not in contact with an inner wall surface of the column and the porous filter, and a leg unit which is in contact with the inner wall surface of the column and the porous filter.</p> |
