Wet and dry separation is a more popular design concept in bathroom design. Using traditional bathroom equipment, after bathing is always full of water vapor everywhere, humid air stagnant in the bathroom for a long time, resulting in air pollution. Wet and dry separation includes the separation of the washbasin and bathroom; or the separation of the shower area from the toilet and basin area. Dry refers to the sink, wet refers to the bathroom. Origin: many of the previous bathroom design is shower and commode set together, in the old house can easily see more than 1 square feet bathroom, the commode is above the shower. The old bathroom design more shower and commode are not separate design, resulting in long time wet water around the commode, seriously affecting the use, and sometimes also accidentally slip and fall. In order to improve the quality of life that puts forward the concept of wet and dry separation, that is, the bathroom and other parts (such as commode) separate, more comfortable in the toilet, safe.