The anti backflow system prevents dirty water from being pumped into the clean water pipe, which is composed of layers of materials. Equipment with anti backflow system will be marked with DVGM passing mark on the package surface. Experience shows that 50 cm long pipes are enough, and 70 cm or more pipes can also be bought on the market.

Being able to rotate 180 degrees makes work easier, while being able to rotate 360 degrees is only meaningful for a sink placed in the center of the house. The elongated shower head can increase the effective radius, increase the possibility of more functions, and the sink and container can be filled faster. In order not to make unpleasant noises, metal pipes should be avoided as far as possible.