We, the Chinese people, have been very mindful of the water consumption. As a result of the illness, the girl has a physical life-cycle with more hot water, and even with all the health of her body, a glass of water shall be consumed earlier. There are also agreed norms for drinking water quantity, “six-cups” per day. But I, born in the North, is not as reassuring about water quality and wants to buy a clean water device. However, there are many net water products on the market, and it is not...