| 摘要 |
A cleaning device (6) with a cross-section corresponding to that of the pipe or tube is pulled through using a string (3) with a length greater than that of the pipe or tube. The string has a weight (4) attached at one end (3a) and the cleaning device attached at the other end (3b). The end of the string with the weight is passed through the pipe or tube first of all and the rest of the string and cleaning device is then pulled through afterwards. |
