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The capacity of almost all the household bathtubs cannot be adjusted according to the users personal features. A child less than 1 meter tall tends to spend as much as water which a 2-meter-tall adult needs. Over the years, the water wasted by families is enormous. In order to change this situation, I designed the bathtub that water capacity can be adjusted.
Simply by rotating the windlass of the bathtub, the end of the bathtub can be rised up, and therefore, the water surface area of the bathtub will be reduced to a reasonable level to meet the need of children.