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This is a device that can make some poor areas use water safely. After preliminary research, Africa's poor areas are to go to rivers and lakes in the distance to get water. Most of them use plastic buckets with thin mouths. This product is suitable for buckets with a radius of 2-3cm. The upper part of the product is a cup. ATM biological fluorescence method is used to detect the water quality, and the fluorescence degree is used to determine the micro water quality Biological content. The lower part is the filtering device.