| 摘要 |
<p>The invention concerns an elongate rod (10) for countering deposition on a conduit (12), the rod (10) being adapted for insertion and location in the conduit (12) and having a substantially helical, longitudinally extending groove (34). When the rod (10) is non-hollow, the groove (34) is on an external surface of the rod (10). Alternatively, when the rod is hollow, the groove is located on an internal surface of the rod and the rod is optionally provided with an additional groove on the external surface of the rod.</p> |
