| 摘要 |
<p>A biological filter (10) for filtering a stream (20) of falling liquid (12), the filter (10) comprising a body (26) having a first filter portion (46) and a second filter portion (48), the body (26) rocking between a first position and a second position so as to alternately position the first filter portion (46) and second filter portion (48) under the stream (20) of falling liquid (12).</p> |
