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Global water scarcity aggravates, washing clothes by the traditional washing machine usually needs to change water for several times, causing a large number of water consumption. Sandglass washer is a green design which gets the inspiration from the sandglass. Its a water-saving washing machine, people only need to add water once, through filtration and purification, the water could be recycled and reused to wash clothes to clean, saving water resource and making full use of the water.