| 摘要 |
<p>PURPOSE:To provide a method for fitting immersion filter materials in an aeration tank which are readily attachable and detachable to and from said tank and, at the time of reverse washing, are swung to improve the washing effect by suspending to support the upper parts of the filter materials, and supporting the lower ends thereof in a freely swingable manner so that the filter materials do not contact each other.</p> |
