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The water that after bathing is often wasted,however,if the water after bathing is collected, it can be used to flush the toilet, which makes the waste profitable. The water after bathing is collected in a water tank at the bottom of the shower room. The water tank of toilet is divided into two parts: a normal tank for clean water and a special tank for used water which is connected to the shower room. The special tank has lower pressure than outside. Because of "Siphon Principle", water will always flow from shower room to the toilet