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In our daily life, if we leave the tap running for 30 seconds, about 6 liters of water (equal to 10 bottles of 600 ml bottled water) will be wasted. About 70 liters of water run out of a tap a day,that is 25 tons of water a year.If we can save the water,it will be a huge amount of water resources. For this reason, I designed this water-saving toilet using the wasted water from the basins. It is used for flushing toilet with water-storage tanks, which contain the wasted water from the basins.