What's the cry for help from the water pipe like knocking at the door? How to solve it? The property management said I couldn't manage it. Sleeping at night woke me up and I was bored to death.

It shows that the tap water pipe in your residential area is filled with air because of water cut-off, and the inlet water pipe will produce noise due to pressure during use, and it is the peak of water use in the morning and evening. As long as someone uses it, the air will make noise when it runs around the water pipe. You can understand that if most people make noise, it means that there is air in the supervisor and treasure in the supervisor, and the property can't be solved. You need to report to the water company and ask for a solution. If it is only in your home, it is that there is air in your water pipe. If you put water into the air, there will be no sound.