In the third world, people live beside rivers. However, dowmstream pollution causes clean water shortage for livelihood and even put the residents’ health in danger. Purego is a portable washing machine that can purify dirty water by manpower. First, users filled the filter tank with river water, and then the purified water goes down the washing tank for laundry. After washing clothes, there is a simple sewage treatment, so it won’t pollute the river again. Purego not only provides an easy way for livelihood water usage, but also limits the vicious cycle on water pollution.