If you are unsure that you have cleared the clog completely and you want to check before you re-assemble everything use a hose to run some water down the pipe.

如果你是搞不清楚，你和你想要彻底清除阻塞检查之前你重新集结出发用软管办一些淡化烟斗。

danci.911cha.org

The first trial run demonstrated that 1 km of high-density polyethylene pipe could be laid down over mountainous terrain and in windy conditions in just nine minutes.

FORBES: Startup Aims To Install Pipelines With Helicopters...Seriously!