| 摘要 |
PURPOSE:To clean a drainpipe without damaging the inside by polishing the inside with a fluid mixture of air with lumps of ice to remove and wash off deposits. CONSTITUTION:Lumps of ice are used so as to remove deposits on the inside of a drainpipe. When a fluid mixture of air with lumps of ice is passed through the drainpipe, the inside of the drainpipe is rubbed with the mixture and the drainpipe can be cleaned without damaging the inside. Since the lumps of ice melt into water, sewage pollution is not caused. |
