First find the credit card area of the water meter, which is usually located in the upper part. Then put the water card directly in this area to brush. The red light on the display screen flashes, indicating that the data in the card has been read into the water meter and can be used normally. On the water meter display screen, we can generally see the recharge and usage, as well as the used and remaining water. In the process of use, if there is prepayment, the valve is open, but if there is arrears, the valve is closed and it cannot be used normally at this time.