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In the poor area, people often drink the sewage water from rivers directly, which carries pathogenic organisms that can transmit disease to humans.This water purifier is prefabricated with activated carbon and gauze itself. People can find materials themselves in the surrounding area according to the instructions of the machine, such as small stones, coarse sand and fine sand. Sewage water can be purified through the filters made of those materials. Meantime, this device has two kinds of usages. It is notable that the design of ball can float in the water and people can avoid letting the device fall into the river bottom while purifying wate