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In real life, a lot of times discovered and toilet adjacent room leakage, and in the maintenance of the discovery of these leaks are from the toilet. The reason that appears this kind of circumstance is, water is from the waterproof layer that toilet doorway is in overflows. Perfect toilet waterproof layer is like a bowl, the water on toilet ground is ceaselessly to go to ground brick above waterproof layer seepage, be equivalent to ceaselessly add water to toilet waterproof layer in this bowl, and height of waterproof layer below toilet door is lowest, resemble a small gap of this bowl edge. As the water level in the bowl continues to rise, the water will eventually overflow from the small gap at the edge of the bowl, which is the waterproof layer under the bathroom door. If you want to stop the water from overflowing through the hole in the side of the bowl, you have to make a hole below the height of the hole and draw the water away. This hole is called a floor drain.