下水道返味是较普遍的现象,其问题主要出在地漏,有的还会发生污水返溢及滋生小虫等问题。地漏是连接住宅中排水系统与室内地面的重要接口,其安装直接影响室内空气质量。老式的地漏是依靠存水形成水封把居室空间和管道系统隔开,如果水封一旦失去作用,下水道中的异味会在居室中散发。传统水封地漏,多数水封高度 Sewer back to taste is a more common phenomenon, the problem is mainly in the floor drain, and some will occur sewage overflow and breeding insects and other issues. The floor drain is an important interface connecting the drainage system in the house with the floor in the room. Its installation directly affects the indoor air quality. Old-fashioned floor drain is to rely on water to form a water seal to separate the room space and the pipe system, if the water seal once lost its role, sewer odor will be distributed in the room. Traditional water seal floor drain, most water seal height