Mr. Chang took to us that the water tap just has little water at home. We went to Mr. Change home and wash pipe. When We checked the pipeline and found rust around the pipe. We used to pipe washer and filled acid water into the pipe. Bwteen 15 min ago.  We started pipe washer. A moment, the pipeline washed out yellow water. There has a little bit oil on the water, It look like very dirty. Such as pic. Mr. Chang said how dirty the water pipes are. Such as a video. One hour ago. The faucet outputs return to normal.

washing pipe