下水是卫生间清洁的一重要一关，要特别注意以下几点：
Water entering is an important part of toilet cleaning. Pay special attention to the following points:
1．存水弯的水封高度要达到50mm，才能不让排水管道内的气泛入室内。地漏、台盆和淋浴的排水管都穿过楼层板，在楼层板下方都设置有存水弯。
1. The water seal height of the water trap shall be 50mm to prevent the air in the drainage pipe from flooding into the room. Drain pipes of floor drain, basin and shower pass through floor slab, and water traps are set under floor slab.
2．地漏应低于地面10mm左右，排水流量不能太小，否则容易造成阻塞。
2. The floor drain shall be about 10 mm lower than the ground, and the drainage flow shall not be too small, otherwise it is easy to cause blocking.
3．如果地漏四周很粗糙，则容易挂住头发、污泥，造成堵塞，还特别容易繁殖细菌。
3. If the floor drain is rough around, it is easy to catch hair and sludge, causing blockage, and also easy to breed bacteria.
4．地漏箅子的开孔孔径应该控在6～8mm之间，这样才能有效防止头发、污泥、沙粒等污物进入地漏。
4. The opening hole diameter of floor drain grate shall be controlled between 6-8mm, so as to effectively prevent hair, sludge, sand and other pollutants from entering the floor drain.
5. 卫生间门下面要加一个一厘米的门栏，卫生间有积水时会从地漏漏入下水道，如果地漏堵死积水也不流
5. Add a one centimeter gate bar under the toilet door. If there is water in the toilet, it will leak into the sewer from the floor drain. If the floor drain blocks the water, it will not flow