How to reduce noise from household PVC drain pipes

In summer, we often use more water for bathing and washing clothes, which greatly increased the flow of pvc drain pipes. Coupled with multiple stories residential buildings, the noise problem has become a trouble. Think about it, just as you are ready to rest, disturbed by rushing drainage noise and can not sleep. It is a painful thing. So is there any way to solve this problem? 

First, it can be started from the installation of PVC drain pipes . For example, try to make PVC drain pipes away from the bedroom and living room, use two 45 degrees connector at the bottom of pipe junction. In addition, you can also put some rubber mat inside of the bottom of pipes to reduce portion of empty sound. 

However, although these methods above can reduce the noise, owners themselves are difficult to control. So is there better way? There is a kind of pvc pipe made from polypropylene resin, joined the sound-absorbing material. It has a good acoustic performance, while maintaining polypropylene's good impact resistance, is the preferred pipe for building interior drains. By adding a special material increases the density of polypropylene pipe, making it difficult for acoustic transmission, which reduces noise and ensure that people have a quiet sleep environment.